(Sitegeist is a regularly update blog written by David Hitt and the staff of Splat Productions.)Hey readers —I’m giving a ninety minute seminar for realtors, developers and other real estate professionals in Philadelphia in a few weeks. I’ll be talking about trends in interactive marketing, namely the rise of social media and its impact on brands. I’m trying to find great case study examples of real estate professionals who have implemented any sort of Web 2.0 plan in their marketing and had success. So, then, if you’re using Twitter to communicate with prospects or have integrated Facebook, blogs or video into your marketing channels, I’d like to hear about it.If you think you qualify — and would like to help me out — leave me a comment below or drop me an email.