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What makes a trend a Trend?
Twitter users now send more than 95 million Tweets a day, on just about every topic imaginable. We track the volume of terms mentioned on Twitter on an ongoing basis. Topics break into the Trends list when the volume of Tweets about that topic at a given moment dramatically increases. Sometimes a topic doesn’t break into the Trends list because its popularity isn’t as widespread as people believe. And, sometimes, popular terms don’t make the Trends list because the velocity of conversation isn’t increasing quickly enough, relative to the baseline level of conversation happening on an average day; this is what happened with #wikileaks this week.

- Twitter Blog: To Trend or Not to Trend…