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After making Timeline widely available, Facebook's following up with its Open Graph promises, debuting its frictionless sharing apps tomorrow, AllThingsD's Liz Gannes reports. Back in September, Facebook explained that verbs were the future of the social network. Facebookers would "watch," "listen," and "read," all the while sharing everything. Since the announcement, it only debuted a few apps, such as Spotify and The Washington Post's social reader. Tomorrow a slew of apps will join these select few, making Facebook a whole lot more active, in a passive sort of way.

Frictionless sharing allows Facebook friends to share experiences, virtually. More active than just posting a link on one's profile, Open Graph apps get users to play along with their friends. But at the same time, the whole experience doesn't feel all that strenuous, that's where the frictionless part comes in. Take Spotify's app, for example. As users listen to music with Spotify, the tracks get broadcast on their Facebook friends's News Feeds without clicking any sort of button. But not just a broadcast tool, the app suggests users listen along with friends, which they can do by clicking the little music note in the side-bar. 

Not all apps are as interactive, like The Washington Post's social reader, which just acts as a quick and easy way to share Washington Post articles on Facebook. But they are all frictionless, meaning the sharing part takes zero effort on behalf of the sharer -- it just happens. 

The discovery part is frictionless, too. The shared items show-up in the Facebook timeline, among photo and status updates -- even if the person doesn't subscribe to that app. With tomorrow's big reveal, there will be even more apps to clutter the time line. And, we imagine, even more verbs as companies and developers get more creative. 

On the developer side, like Apple, Facebook has an approval process, which it details on its developer's blog. Facebook said it would not debut third-party apps until all Facebook users had Timeline because Facebook hopes the two new features will work in tandem to document every living moment of one's life. By now, everyone should have Timelines, since Facebook threatened a changeover within a week from its roll-out back in December. Tomorrow we'll get to see what other actions we can share with friends and start living our Facebook-induced public lives.

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