TweetDeck is a social media dashboard app that allows users to manage multiple Twitter accounts from one interface. It interfaces with the Twitter API to send, receive, and view tweets and profiles. Originally supporting other networks like Facebook and LinkedIn, it now only supports Twitter and Facebook. Key strengths include its free cost, simple setup, customizable columns. Weaknesses include an inability to schedule tweets with photos or access lists. The document suggests TweetDeck may not be useful for businesses due to past negative reviews and limited convenience and benefits.