By default, profile posts (and I think comments--someone please confirm) are limited to 420 characters. When you exceed the limit, you get this notice: That's very ambiguous in that you don't know how many total characters you have or how many characters are over the limit. I personally end up going to http://www.lettercount.com/ (I could also use OpenOffice Writer, but it's quicker to go to that site for something like this) to see where I'm at and how many separate comments I have to post to get everything I want to say posted. Profile statuses, which are limited to 140 characters, have a count of how many characters you have remaining to the left of the Post button. Perhaps something like this could be added for profile posts.