The effortless meme (on my part, at least):
I know very little about some of the people on my friends list.
Some of you I know relatively well. Some I know very well; one or two of you I even know in RL.
Some of you I hardly know at all. Perhaps you lurk, for whatever reason. But you friended me and I thank you for your interest in my words.
But here's a thought: why not take this opportunity to tell me a little something about yourself? It can be any old thing at all. Just so the next time I see your name I can say: "Ah, there's so and so...they listen in rapture to the love-music of she-turnips." I might feel compelled to mock your musical taste, but I'll certainly remember you.
I'd love it if every single person who friended me would do this. Yes, even you people who I know really well. Then post this in your own journal and see what gems of knowledge appear.