https://www.breitbart.com/tech/2018/10/15/twitter-facing-investigation-for-user-tracking/
Twitter Facing Investigation for User Tracking
Twitter is reportedly being investigated in Ireland over alleged tracking of users through its special shortened links.
According to Fortune, one privacy expert suspected that Twitter “gets more information when people click on t.co links, and that it might use them to track those people as they surf the web, by leaving cookies in their browsers,” and so requested further details from Twitter, which the company rejected on the grounds that it would be too much effort to compile the information.
In response, the man “complained to the Irish Data Protection Commission (DPC), which on Thursday told him it was opening an investigation.”