TweetDeck users have less than three weeks to keep using Twitter's power-user software for AIR, iPhone and Android, according to an update on the TweetDeck blog. TweetDeck will disappear from app stores on May 7, and the service will also eliminate its Facebook integration.

The update indicates that the sunset of most TweetDeck clients, which was announced March 4, is continuing on schedule. At the time, the TweetDeck team said that it would focus on improving the Web version of TweetDeck. It also promised to continue working on the TweetDeck clients for Mac and PC.

"We think these web and Chrome apps provide the best TweetDeck experience yet, and that they are the apps in which you'll want to see us add new capabilities first, followed closely by our Mac and PC apps," the company said in a blog post.

"Old technologies fade into obsolescence."

While TweetDeck's mobile clients never enjoyed much popularity, the AIR client was widely used by TweetDeck enthusiasts who found it to be more fully featured than the Web version.

The TweetDeck update comes a day after Twitter said it would discontinue Twitter for Websites support for Internet Explorer 6 and 7. The feature lets publishers and developers embed tweets and Twitter buttons on their websites. "The web does not stand still," said Ben Ward, who leads the Twitter for Websites team, in a blog post. "New browser technology allows us to write simpler, faster, smaller code. Old technologies fade into obsolescence."