French newspaper Le Monde has a nice infographic of social networks around the world, Réseaux sociaux : des audiences différentes selon les continents. Unlike search, which has been dominated by two players and a few local upstarts, this map looks like patchwork.
Lovely site! I am loving it!! Will be back later to read some more. I am bookmarking your feeds also. http://www.ozniotshhorot.com/electronics/video-marketing-best-practices-suggestions/