I didn't know that was possible:
I wonder if it's possible to block yourself, so that you can't post in ytour own topics?
No:
This is either very interesting or very sad.
I deleted myself though, because my tracked activities were filled with the stuff I posted.
Poor kid.
As a result of this thread I just tried to challenge myself to a game, but you can't do that either unsurprisingly. Still, you can be your own friend. Who knew.
I didn't know that was possible: