So I'm a major Twitter fan. It helped me find a flat and a job...not bad, eh? I have no idea what the technical requirements of this would be, but I would absolutely love the ability to refer to other members in posts in a more intelligent way than simply emboldening their names. I would love to be able to type "@thatjohn" and have it automatically link to ThatJohn, for example. Given that this is an actual honest-to-God website, I prefer the Facebook implementation where there's some AJAXy wonderfulness that sense-checks that I haven't typed "tahtjjon", and lets me tab off it after determining that none of my friends are named ThatJohn, but a barebones Twitter style implementation that linkifies in the backend would be acceptable if the former is unworkable. Thoughts?