an official tagging component is long overdue. Personally I think it should happen before 3.1. IPB is getting too aged to wait for some of these features.
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Official Social bookmarking would be nice too. It's in the blog system, but we can't do it for topics. I don't see how the systems should differ that much. Maybe make it a component so it that can work across all the different systems like blog, IPB, etc.
It would be nice to be able to twitter a blog or topic by just clicking a link from the board. Like say I want to twitter to all my friends that IPB just released 3.0. I should be able to click a link off the company news announcement and have it get twittered.