Suppressing of #Iranelection not deliberate

So, Twitter did not do this deliberately against #Iranelection or anything (why would it?), but still, it kept the word from getting out in favor of "immediately popular" topics like World Cup and names I assume have to do with the World Cup.
That does not mean that previous topics are not relevant to today, however; a new surge in what was from the past could become "interesting" again. In the case of #Iranelection, it is more than just "interesting", it is vital for the Green movement in Iran, which relies on the Internet for communication. Perhaps they should create a new hashtag for it to become an "immediately popular" topic.

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About Trending Topics

Charles Jan 19
UPDATE: Recent Trending Topics Improvements

5/14/2010

Twitter is about what is happening right now, and we have recently updated our trending topics algorithm to reflect this. The new algorithm identifies topics that are immediately popular, rather than topics that have been popular for a while or on a daily basis, to help people discover the "most breaking" news stories from across the world. (We had previously built in this 'emergent' algorithm for all local trends, described below.) We think that trending topics which capture the hottest emerging trends and topics of discussion on Twitter are the most interesting. While this is very much a work in progress, with this tweak we have taken a big step toward capturing how trends quickly emerge and grow on Twitter. We also think it's compelling to know what the "most popular" topics are, and we will look to capture this in some way in the future.

It is important to note that this new algorithm does not "block" any topics from trending. If topics you saw regularly in your Trending Topics menu have disappeared or are not showing as consistently as before, do a saved search for them on your homepage. That way, in one click, you can view search results for topics that matter most to you. Also consider localizing your Trending Topics menu, as shown below.

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