Burning Tags extends the functionality of the “hot tags” cloud shown on the front page of most bbPress forums by limiting the cloud to tags that were recently used.
Imagine that spinach was really popular on your forums three years ago, but nobody talks about it much anymore. Your tag cloud is filled with spinach-related tags, preventing more recent fads, like carrots, from being front and center.
Burning Tags fixes this problem with a simple algorithm. Only topics that have been posted on in the last 30 days are counted towards the tag cloud, and topics with more posts are more important on a logarithmic scale.
For you math geeks out there, it’s
I = t + ln(p), where I, t, and p are importance, topics, and posts respectively.