From Echofon: Echofon offers a twitter client, with that, account switching is easy and you'll see a subtle notification for mentions and messages you receive in background accounts. Unread tweets stay in sync with your iPhone. If you read tweets on your MAC, and later open up Echofon on your iPhone, you can pick up right where you left off. It has full search support including trends and saved search and photo previews right in your timeline, and a pop-up photo viewer.
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