"Oh boy, a handy dandy tag system!"
"Wow, I'm so excited I can follow my favorite Bungie.net posters!"
"Gee willakurs, I can share my Bungie.net posts to Facebook!"
"Wowzers, I can like people's posts!"
Lol?
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I'm not quite seeing what abuse you mean?
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Remember the tags for Reach screenshots where people rammed stuff
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Of all the new features, the ones you listed are probably the least likely to be abused...