But they're focused on photos and video rather than text.
Yfrog has launched a pair of Twitter apps - one for Android and one for BlackBerry - designed to help people tweet their photos and videos.
The company is already known to some mobile users for its image-hosting service, which is an option in some iPhone Twitter apps like Tweetie.
However, the company's own apps run the risk of being too laser-focused in their featuresets.
Both focus on images and video rather than text tweets, although the Android version has extra features like search and GPS-tagging.
The problem is that increasingly, fully-fledged Twitter apps let users do all this as well as tweeting text. The argument for having a separate app for multimedia isn't entirely clear.
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