After literally years of procrastination, I have taken the plunge into the world of micro-blogging. I may be found on Twitter here: http://www.twitter.com/ahbleza/
I've been very careful about joining various social media sites -- I decided long ago to avoid MySpace, Bebo, Facebook and the like. I am active on LinkedIn for professional purposes, and occasionally maintain my old personal web site -- http://www.gillingwater.org -- but that's down at present until I get a chance to update it.
Twitter is a lot of fun, and functions wonderfully as a disintermediation device between various minor (and a few major) celebrities and their stal^H^H^H^H fans. If you've not joined up, I recommend it!