A general overview of how Chatter Trending Topics determines the trend.
Trending Topics measure the rate of change of topic usage. This means the total number of posts/comments with a topic is less important than the change to that number.
Trend stats are updated approximately every 4 hours.
Trends are recalculated every 4 hours, which means posts older than 8 hours don't play a factor in the current trend.
A tag must be used at least 3 times by at least 3 different users in the 4 hour period to qualify.
During a trend calculation:
- #commonTopic - has 40 posts - had 35 posts last time - Trend value = +5000383047

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