It's a sad day for TweetDeck lovers, boys and gals. As of now, the Android, iOS, and Air versions of the app are no more.
Upsetting as it may be, this shouldn't come as much of a shock to anyone – Twitter announced it would be retiring these now-defunct options back at the beginning of March. Mobile users are, of course, encouraged to switch to the official Twitter app, while desktop users have the option of either TweetDeck's standalone application or its browser-based tool.
This doesn't just mark the death of those TD variants, either – Facebook integration has now been canned, as well.