Social networks may still seem like an emerging medium, if an ad medium at all, on some parts of Madison Avenue, but a new report on the media buying plans of advertisers and agencies indicates that having a “presence on social networks” is one of the top priorities of their media plans for next year. The report, the 2010 Media Planning Intelligence Study, which is being released today by the Center for Media Research in conjunction with InsightExpress, found that 57.7% of respondents “ideally” plan, and 56.3% “realistically” plan to include social media in their media plans next year.