Whisper.

About Whisper

Whisper was a free proprietary mobile app. It was a form of anonymous social media, allowing users to post and share photo and video messages anonymously, although this claim has been challenged with privacy concerns over Whisper's handling of user data. The postings, called "whispers", consist of text superimposed over an image, and the background imagery is either automatically retrieved from Whisper's search engine or uploaded by the user.