Violates Privacy for Ad Campaign
When a tweet goes out on Twitter that a user didn't send, the concern is usually that the account has been hijacked by a malicious user. In 2013, three users on Twitter were surprised to find out that their user names and images had been used as examples in a marketing campaign created by Twitter itself.
Fake tweets attributed to three real Twitter accounts were used in a graphic on the Twitter advertising blog introducing the company's TV ad targeting service.
Source: Enid Burns - E-Commerce Times