It seems that my answer here was edited by "Community":

http://sharepoint.stackexchange.com/questions/12731/read-only-column-in-a-sharepoint-list/12923#12923

I don't get the point of the edit, but that's not my main concern. 

What I don't understand is why this account is editing posts in the first place. The account's mission is explained here:

http://sharepoint.stackexchange.com/users/-1/community