BTW: I'm
currently 49 years old, have a little more than "normal" activity
 on the net, worked as Unix Sysop for many years...but I still don't know
 what for I should need Twitter and Facebook.. 
 It's there to waste time. Or optionally so people can reveal
 parts of they private life, then regret they didn't keep it private. 
 
I use Twitter as sort of a "hep IRC." But it helps to have your own client
(TTYtter), which is text-based, and the presence of a (somewhat) stable 3rd
party API is Twitter's ace in the hole. So it cuts down on a lot of crap
to have it whistling merrily away in a terminal window and I can glance at it
when I notice a lot of activity.
I don't trust Facebook.
--
------------------------------------ personal: 
http://www.cameronkaiser.com/ --
  Cameron Kaiser * Floodgap Systems * 
www.floodgap.com * ckaiser at 
floodgap.com
-- The fact that it works is immaterial. -- L. Ogborn -------------------------