[Merge] lp:~kai-mast/friends/fix-retweets into lp:friends

[Robert Bruce Park]

Review: Approve

Kai, thanks for this branch. I merged it with some changes, you should review them here:

http://bazaar.launchpad.net/~super-friends/friends/trunk/revision/247

Note how I managed to achieve the same logic without having to do any dictionary membership tests.
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https://code.launchpad.net/~kai-mast/friends/fix-retweets/+merge/198019
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