Someone tagged you in a profile post - Here's where they tagged you: https://www.ecocitycraft.com/forum/members/georgiamc.26319/#profile-post-35671
Possibly a profile post with a tag that was then deleted. At least that is/was one cause I know of. EDIT: Aw, too slow. .-.
Haha. Kuke was the first person to figure out how to make blank alerts and spammed me with it, lol - It's more of a bug in XenForo if anything. I generally just look at the said users messages to find where they tagged me - If nowhere, then the post was deleted.
I think I did the same thing to 314. Or at least told him about it. (partially, because he still thinks you have to delete the post to get the blank alert. :b)
No. At least... not yet. Why do I have the feeling that this may change soon...? Correct. I had very limited time available before I had to leave, so I posted the first thought that came to my mind without further thinking - I received too many empty alerts from normal tags without deletion to not know that.