Occasionally someone will post a message that consists in its entirety of a period character (.). What does it mean?
They deleted their post by editing it?
It means an earthquake got 'em.
It could also mean 'I agree'. It's like a ditto.
Why would a person ditto himself, as I have seen. Comment followed momentarily by one of those naked period comments.
Why did the chicken cross the road?
cloud is correct. if you try to edit after you post, cos you decide you dont want to post sth afterall, you cant leave a blank field, you need at least one character.
In my case above, I accidentally clicked "Post" twice (because there was lag), so post appeared as duplicate, and I replaced the duplicate with the dot.