Why are we all (or almost all) using nick names

Why some members of this forum seem to give their real names, others their first name, the majority nick names ?

I like very much some posts, some stories and as an owner if I want to contact somebody it becomes quite difficult to find who is who.

Being a sitter too, I managed to find Jane as I knew she had kept the same dog than I in Guernesey and she lived there… Easy ! With a nickname, it would have been impossible to find out !

Do sitters know owners can select directly sitters on THS lists of sitters made by country/town ? We can send a private message to people whose profiles we like.