Windows 10, Chrome 44:
8 Mi Piace
Why would you have a mention in your About Me? That’s bizarre.
1 Mi Piace
I needed to give a shoutout to myself.
3 Mi Piace
1 Mi Piace
Allow myself…to introduce myself. My name is rc4, and this is my shiny new badge.
Right? 
Bots generally have mentions to their owners so if there is an issue with them we know who to report it to.
1 Mi Piace
Only if the topic was in the bug category and liked by a discourse team member.
10 Mi Piace
Why would you have a mention anywhere else? To refer to another user.
10 Mi Piace