almost everyone in my office is on fb, yahoo, youtube, etc. mostly for marketing our companies.. but some personal use as well. pretty lax and unregulated.

of course social media does not replace human interaction, it is like a phone.. a tool to communicate...

i recently saw some quote where 40% of newlyweds met online... not a bad way to meet (better than at a bar, drunk) but also has drawbacks (the "girl" you are chatting with could be a big fat greasy guy from Wisconsin, or worse).

my reasons i am so active are:
a. my quest to learn more about sailing, rigging, etc.
b. i want/need an entertaining distraction at the office (i rarely post from out of the office)