While Twitter doesn’t reveal the exact formula, they have provided some details about how #TT’s are selected. The main things to remember are:
► Twitter may count total people tweeting more than total tweets.
► Twitter counts topics that are newly popular. This means topics must be “breaking” or “peaking” in order to trend.
► Topics that have been popular for awhile will not trend again (or will not keep trending) unless new people begin tweeting about them in large numbers in a short period of time.
► If Twitter allowed simply whatever is being tweeted about the most to always trend, large groups could dominate the trending topics all the time. In fact, this is what used to happen before Twitter implemented its algorithm.