YouTube is trying out some new features with a very select few users. Autoplaying videos is supposed to boost watch time, and no doubt ad revenue, while GIF sharing makes sharing videos more fun.
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Twitter announced yesterday that it would start supporting embedded GIFs within tweets, but it looks like Twitter has pulled the wool over users' eyes by using a different format instead.
Twitter now supports animated GIFs on its website as well as Android and iPhone apps. Support for the animations isn't available in its Windows Phone app yet, however.