Most advertising execs are quick to jump on the social media bandwagon when it comes to marketing a product to consumers, but when it comes to marketing themselves, not so much. A recent study by RSW/US took a look at the business-to-business social media habits of a variety of ad agencies. As reported by Brandweek, 54% of the agencies polled said they never or rarely use social media when prospecting for new clients. Of those that did use social media for outreach,