[gvurrdon]

Having never used Facebook I find that I don't need it for most things. But, there are some activities in which I'm involved where almost all discussion and event organisation takes place on Facebook. My participation has thus decreased significantly over the past decade. The organiser of one such event (to which I've been going for years) mentioned to me recently that of the approx. 20 people giving presentations there I was the only one not on Facebook, requiring him to email me separately. Many people wouldn't make that effort any more.