For me, Web 2.0 has made socialising with my friends and business colleagues in my existing social networks much easier.
Web 2.0 interaction lets me connect to people outside my immediate network, to bring them closer to me in my social graph.
It also allows me to see what is going on in my second degree network, my friends of friends network. I can stay in touch with colleagues and partners with whom I only tend to work for a few weeks per year. I can find out what my business connections are working on at the moment, which gives me an opportunity to reconnect with them and remind them of my consultancy skills. Social tools such as Facebook, LinkedIn and Twitter allow me to see what the friends of my friends are ...