TT
TT has 2 meanings
Trending topic
Example
Please help! Hashtag #mytopic to make it a TT on Twitter!
TT definition by Slang.net - The Slang Dictionary
This page explains what the acronym "TT" means. The various definitions, examples, and related terms listed above have been manually compiled and written by the Slang.net team.
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TTs, or "trending topics," are Twitter topics that a lot of people are talking about. These topics appear on Twitter's Trending page, listed in order of popularity. Usually, TTs are region-specific (for example, a U.S. user sees U.S.-specific TTs).
You're most likely to see TT used by those who want the topic they are discussing to become a trending topic. Their tweets may contain phrases such as "let's make this a TT!" or "hoping this goes viral and becomes a TT."