I'm just interested to see how many VA's have actually gained clients from the various Social Networks and which ones you have gained the most clients from?
Twitter has been helpful for us. We have built relationships with a few of our followers and then they have referred us to some of their clients or people they know that could use us.
I find Twitter to be quite useful like this - you can search on certain terms, you can post what you are doing. I use Facebook too and have picked up a couple of clients that way.