Acquaintences - For people I don't know or barely know.
Friends - For people I know and trust with a fair amount.
I won't list who's on what lists. But I will be posting a post locked under the "Friends Filter Test." So if you think you should be in that filter and you DON'T see a post entitled "Friends Filter Test" in the next 48 hours, let me know here. I have a lot of people to go through, it is probably just a mistake.