More on Twitter’s ecosystem strategy shift
Twitter has allowed those companies to access "tweets" generated by Twitter users, and those programs were vital to Twitter's growth because they helped people sort through, organize, and search for "tweets" in a way that Twitter couldn't.
But over the past year or so Twitter has looked to exert greater control over its user base as it has introduced advertising on its site. Twitter acquired some of those application companies, including TweetDeck, and developed its own services that rendered some other third-party companies obsolete.
UberMedia also tried to purchase TweetDeck, people familiar with the matter have said.