I use Facebook to build my network of people who share the same interests that I have, the obvious being that I live in Ronda. The various fan pages I have are also very useful and bring in a decent amount of referral traffic to my websites.

Twitter is something I use every day as well, but for business use doesn't work well for me, I rarely get referral traffic to my websites. On the other hand I found when I used it as a personal feed for whatever was going through my mind I got a much greater response, but almost no benefit business-wise.