Phone app fans of word games likely already knows about Words With Friends — but adding the popular Scrabble-like game to Facebook should make dwell times on the site soar. You can play multiple opponents simultaneously. And the more games you have going, the more likely you are to stick around. At its heart, the Facebook version is basically the same as the mobile version, but adds a couple new features like Brag Feeds (letting you gloat about triple word scores) and the ability to challenge friends directly through their news feeds.  For word aficionados, this is one Facebook that will be hard to resist.

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