I use BoD (originally Bridge o' Doon which got lost in one of the changeovers) simply because it was the sort of thing that most people were doing when I joined RMweb. As a teacher at what was, back then, a challenging school, I thought it best not to use my real name on any social media. Also at that time Union and school advice was very much don't use it.
I am much more relaxed about this since I retired and have even opened a facebook account up in my real name to share things with family and friends.
Yours
Seymour Shagnasty