I use Twitter to bookmark the fic that I have read and enjoyed (which people do insist on interpreting as fic recs), drop the kind of random bizarre link that I used to give IRC, make the sort of random bizarre statement that I used to make in IRC (the things that you would IM seven friends with and sort of hope someone wrote back, or announce one's presence to the Eternal Chat with), and carry out the sort of chatter one might have on IM but one might as well have in public.

Also sometimes what one had for lunch, and whether or not one has a sore throat, because this can be useful later.

I import mine (as you doubtless have seen) with a cut because I care. This is because I abhor the thought of my historical going undocumented.