spam It seems that most of the recent spam posts on MathOverflow have the same patter as we have seen previously. They contain link to the same domain (different from the domains in the previous instances), several posts by the same user, username change between the posts.

For example, spam posts with some different domains were posted in January: chat.stackexchange.com/transcript/9369/2019/1/15 chat.stackexchange.com/transcript/9369/2019/1/21