Apropos of nothing, a term occurred to me to replace the overworked and usually misused 'meme' for the things that bounce around your friends list: rote. This specifically applies to instruction-based posts, such as "Ask me five questions, then post this in your own journal", and not to quizzes, which already have a name anyway. Arguably, these could be more accurately described as recipes than rotes, but the term seems both more cumbersome and more ambiguous.
Rote also refers to the susurration of waves on a beach*, which I find fitting.
Rote also refers to the susurration of waves on a beach*, which I find fitting.