In local community FB posts I'm seeing replies from people with usernames like DaringAlligator2732 and ConcernedHomeowner14048. These don't seem like the "real identity" facebook usernames; they kind of feel like anonymous or sometimes even randomly generated names. How and why does that happen? Has it been happening for a long time?
That’s an option for people to post/reply anonymously. It has its uses, like if you want to ask an embarrassing question on a public group. But as anything else. obviously it can be abused.