Some good info on ad placement in social networks over on eMarketer today. MySpace and YouTube top the list (not surprising). Driving traffic and brand awareness are the top reasons for the placements. One of the questions posed is how do people use search when they are interacting within these social networks?

Interesting to see Craigslist in the #5 spot for the most ad spend. Good sign that local ad spending and hyper-local audiences are being considered across the board.