cereta posted an entry
"What I assume you know about me", listing things to give context for her LJ posts. It's a cool idea (so of course it became a meme), though I'm actually not even sure what I assume you know about me, or what would be most useful to know to provide context. Clearly I think much less about audience than others.
( not exactly succinct, I'm incapable of not rambling, you could probably count that as additional point *g* )