The comment notification system is quite intelligent – it ignores special characters (see Comment notification special characters). However, in my name, I have a period after my first initial. As an academic, I've published papers using the same moniker and thought it professional here to follow the same form. (So it's a personal choice and I understand if this is status-declined!)
However, I don't believe that the next three forms notify me when individuals leave a comment:
@M. Tibbits<-- because of the space
@MTibbits<-- no period
@M Tibbits<-- space and no period
Including a space, the system stops and doesn't notify me. I can live with this, almost all of the higher rep users know to remove the spaces (excellent filter by the way...). But the second one bothers me. Somewhere—perhaps removed—I think Cody commented to me but left out the period, and I missed it for more than 24 hours. I believe the only way to notify me is to post:
@M.Tat a bare minimum
@M.Tibbitsto be fully accurate.