21.1% of all ads served on the internet is on the social networks. Here is the distribution of online ads among the social networks:

MySpace : 43.60%
Facebook : 38.86%
Tagged : 2.84%
MocoSpace : 0.94%
Hi5 : 0.47%
Bebo : 0.47%
Classmates : 0.47%
BlackPlanet : 0.47%
GaiaOnline : 0.47%
DeviantArt : 0.47%

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