The dream of having social viral channels for app discovery is still a ways off, but that doesn’t mean unofficial app stores can’t make moves in this direction.

GetJar, an independent app store backed by Accel Partners that says it has powered 1.5 billion downloads to date, launched a Facebook integration today that lets users share their download activity and use “like” and “dislike” buttons to help friends decide what apps to install and what to ignore.

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