Board Thread:Off topic/@comment-38440599-20191011190817/@comment-37748506-20191018005046

builderman is an account which was used by David Baszucki during the very early stages of Roblox. All of the accounts you linked appear to just be accounts which have a goal of following as many users as possible (possibly followed these users via a bot, but I have no way to know this other than make simple assumptions). They are all unofficial.