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Privacy Evaluation for Slack

Last updated February 11, 2021

Overview

Slack is a business communication service. According to Slack's policy, when an authorized user submits information, it may be displayed to other authorized users in the same or connected workspaces. In order to create or update a Workspace account, the user or their Customer (e.g., the user's employer) supplies Slack with an email address, phone number, password, domain and/or similar account details. Slack's security policy lists several security-related audits and certifications are applicable to the Slack services, and it uses encryption. It is unclear what obligations Slack has to children under 13 or 16 if use is not prohibited by law, or if Slack itself has knowledge a child is using its service.

Slack can be accessed through its website, and is available for download at the iOS App Store, and the Google Play Store. The Privacy Policy and Terms of Use used for this evaluation can be found on Slack’s website, iOS App Store and the Google Play Store. Additionally, other policies used for this evaluation include: Acceptable Use Policy, Privacy Shield Notice, and Security Policy. This evaluation only considers policies that have been made publicly available prior to an individual using the application or service.

Safety

According to Slack's policy, when an authorized user submits information, it may be displayed to other authorized users in the same or connected workspaces. The policy notes that the service is used for collaborating with others, and that the services provide different ways for authorized users working in independent workspaces to collaborate, such as Slack Connect or email interoperability. Other information, such as an authorized user’s profile information, may be shared, subject to the policies and practices of the other workspace(s). Slack's authorized use policy indicates that users must not use the services in any manner that may harm minors or that interacts with or targets people under the age of thirteen nor engage in activity that incites or encourages violence or hatred against individuals or groups;

Privacy

Slack's policy calls corporate users "Customers." Customers or individuals granted access to a workspace by a Customer (“Authorized Users”) routinely submit Customer Data to Slack when using the Services. Slack also collects, generates and/or receives other Information, including workspace and Account Information. For example, in order to create or update a Workspace account, the user or their Customer (e.g., the user's employer) supplies Slack with an email address, phone number, password, domain and/or similar account details. Slack's policy says they do not sell the personal information they collect and will not sell it without providing a right to opt out. The policy notes that third parties may, for example, provide virtual computing and storage services, or that Slack may share business information to "develop strategic partnerships" with third party service providers to support their common customers.

Security

The Slack security policy explains that they place strict controls over their employees’ access to the data corporate customers and their users make available via the Slack services, and it also lists several security-related audits and certifications are applicable to the Slack services. Data is encrypted in transit and at rest while in storage, according to this policy. The policy notes that in the event of a security breach, Slack will promptly notify you of any unauthorized access to your Customer Data.

Compliance

Slack's policy notes that to the extent prohibited by applicable law, Slack does not allow use of their services and websites by anyone younger than 16 years old. If a user learns that anyone younger than 16 has unlawfully provided Slack with personal data, Slack's policy asks that the user please contact them and they will take steps to delete such information. It is unclear what obligations Slack has to children under 13 or 16 if use is not prohibited by law, or if Slack itself has knowledge a child is using its service.

Data Collection
SCORE: 35%

What data does it collect?

  • Personally identifiable information (PII) is collected.
  • The categories of collected personally identifiable information are indicated.
  • Unclear whether the collection or use of data is limited to product requirements.
  • Geolocation data are collected.
  • Unclear whether this product collects biometric or health data.
  • Interactions, behaviors, or usage analytics data are collected.
  • Unclear whether this product collects sensitive data.
  • Data is automatically collected.
  • Unclear whether opt-in consent is requested from users at the time personal information is collected.
  • Personal information of users is collected by a third party.
Data Sharing
SCORE: 85%

What data does it share?

  • Collected information is shared with third parties.
  • The categories of information shared with third parties are indicated.
  • The purpose for sharing a user's personal information with third parties is indicated.
  • The categories of third parties that receive data are indicated.
  • Data are shared for analytics.
  • Data are shared for research and/or product improvement.
  • Third-party services are used to support the product.
  • The roles of third-party service providers are indicated.
  • Third-party login is supported.
  • Contractual limits are not placed on third-party data use.
Data Security
SCORE: 85%

How does it secure data?

  • Unclear whether a user's identity is verified with additional personal information.
  • Account creation is required.
  • Managed accounts are available.
  • Multi-factor account protection is available.
  • Third-parties with access to information are not required to provide the same security protections as the company.
  • Reasonable security practices are used to protect data.
  • Employee or physical access to user information is limited.
  • All data in transit are encrypted.
  • All data are stored in an encrypted format.
  • Notice is provided in the event of a data breach.
Data Rights
SCORE: 55%

What rights do I have to the data?

  • Unclear whether users can create or upload content.
  • Unclear whether users retain ownership of their data.
  • Processes to access or review user data are available.
  • Processes to modify data are available for authorized users.
  • A data-retention policy is available.
  • Processes for authorized users to delete data are available.
  • A user's data are not deleted upon account cancellation or termination.
  • Unclear whether this product deletes data when no longer necessary.
  • Unclear whether methods are available to restrict who has access to data.
  • Processes to download user data are available.
Data Sold
SCORE: 35%

Is the data sold?

  • Personal information is not sold or rented to third parties.
  • Unclear whether users can opt out from the disclosure or sale of their data to a third party.
  • User information can be transferred to a third party in the event of a merge, acquisition, or bankruptcy.
  • Unclear whether users are notified if their information is transferred to a third party.
  • Unclear whether user information can be deleted prior to its transfer to a third party.
  • Third-party transfer is contractually required to use the same privacy practices.
  • Unclear whether user information that is shared is shared in an anonymous or de-identified format.
  • Unclear whether the company describes their de-identification process of user information.
  • Data are shared for research and/or product improvement.
  • Contractual limits do not prohibit third parties from reidentifying or de-identified information.
Data Safety
SCORE: 50%

How safe is this product?

  • Users can interact with trusted users.
  • Unclear whether users can interact with untrusted users, including strangers and/or adults.
  • Profile information must be shared for social interactions.
  • Personal information can be displayed publicly.
  • Users can control how their data are displayed to others.
  • User-created content is reviewed, screened, or monitored by the company.
  • Unclear whether user-created content is filtered for personal information before being made publicly visible.
  • Unclear whether social interactions between users are moderated.
  • Unclear whether social interactions of users are logged.
  • Users can report abuse or cyberbullying.
Ads & Tracking
SCORE: 45%

Are there advertisements or tracking?

  • Unclear whether personal information are shared for third-party marketing.
  • Unclear whether this product displays traditional or contextual advertisements.
  • Personalised advertising is displayed.
  • Data are collected by third-parties for their own purposes.
  • User's information is used to track and target advertisements on other third-party websites or services.
  • Data profiles are created and used for personalised advertisements.
  • The company can send marketing messages.
  • The company does provide promotional sweepstakes, contests, or surveys.
  • Users cannot opt out of contextual, or personalised advertising.
  • Users can opt out or unsubscribe from marketing communications.
Parental Consent
SCORE: 40%

Can I provide parental consent?

  • Not intended for children under 13.
  • Personal information from children under 13 years of age is not collected.
  • Unclear whether intended for parents or guardians.
  • Company does not have actual knowledge that personal information from users under 13 years of age is collected.
  • The company does not provide a section, heading, or separate policy for children in their policies.
  • Unclear whether parental consent is required before personal information is collected or disclosed.
  • Unclear whether this product limits parental consent with respect to third parties.
  • Unclear whether this product allows parents to withdraw consent for the further collection of their child's information.
  • Children's personal information is deleted if collected without parental consent.
  • Unclear whether this product provides parental consent notice and method for submission.
School Purpose
SCORE: 0%

Is the product intended for school?

  • Unclear whether intended for students.
  • Unclear whether personal information or education records are collected from preK-12 students.
  • Unclear whether intended for teachers.
  • Unclear whether this product is primarily used by, designed for, and marketed toward students in grades preK–12.
  • Processes to enter education records into the product are not described.
  • Unclear whether additional rights or protections may be provided with an additional school contract.
  • Unclear whether the company is designated as a school official.
  • Unclear whether this product transfers parental consent obligations to the school or district.
Individual Control
SCORE: 25%

Can I control the use of my data?

  • Users can control the use of their information through privacy settings.
  • Unclear whether use of information is limited to the purpose for which it was collected.
  • Unclear whether the conext or purpose for which data are collected is indicated.
  • Company may combine data with additional data from third-party sources.
  • Unclear whether this product treats combined information as personally identifiable information (PII).
  • Unclear whether notice is provided if the context in which data are collected changes.
  • Unclear whether consent is obtained if the practices in which data are collected change.
  • A grievance or remedy mechanism is available for users to file a complaint.
  • Unclear whether users can request to know what personal information has been shared with third parties.
  • Unclear whether notice is provided in the event the company receives a government or legal request for a user's information.

Common Sense Standard Privacy Report (SPR)

The standard privacy report (SPR) displays all the privacy practices from a product's policies in a single, easy-to-read outline. The report shows a green check mark for better privacy practices and an orange alert for risky or unclear practices. This alert indicates that more time should be focused on these particular details prior to use.

About Privacy Evaluations

The privacy evaluations have been designed with the help and support of a consortium of schools and districts across the United States. These evaluations are designed to help educators make informed decisions about the potential privacy implications of educational technology used to support teaching and learning.

Our core evaluation criteria will always be freely available. People are encouraged to read the questions we use and our information security primer. Vendors are encouraged to use our questions and the information security primer to self-evaluate. You can also learn more about our evaluation process. Please be in touch with any questions or feedback.