Board Thread:Questions and Answers/@comment-29776358-20170803172502/@comment-32689223-20170805131958

TB represents TieBa, which is like a Chinese version of Twitter or VK and it's very popular in mainland China. There are currently 2 active hackers on TB, as far as I know. They normally only use the bug to challenge other TBers, but sometimes they cannot find one, so that's why we get challenged by them