C-SPAN recently announced a partnership with Foursquare, the geo-location social media tool that really took off at SXSW this year. From BrandChannel: "Far from stodgy public access programming, C-SPAN has been embracing social media (and taking its shows on the road) as it pushes for greater public access through media coverage of the House and Senate and the Supreme Court. "Now, Foursquare users who friend…