1: I subscribe to some of the more noted webdevelopers in the world
2: I subscribe to tech crunch
3: I subscribe to TUTS sites
4: I subscribe to BKSolutions
5: I subscribe to the various web developers on here (means I can shout out a anyone available for a quick bit of feedback) or I can say anyone got a way of doing an XML sitemap via php and a cronjob as I did yesterday and I'd a response in a few minutes.
6: I tell people boring stuff like morning all... it builds up some level of social networking with people
7: It can be confusing it can be fun it can be silly. Its really what you make of it I'm subbed to 100 people and have about 150 following me. You can DM people via twitter as well.