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Top Social Networking Site #1 : Facebook
900,000,000 - Estimated Unique Monthly Visitors
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310,000,000 - Estimated Unique Monthly Visitors
Top Social Networking Site #3 : LinkedIn
250,000,000 - Estimated Unique Monthly Visitors
Top Social Networking Site #4 : Pinterest
150,000,000 - Estimated Unique Monthly Visitors
Top Social Networking Site #5 : Google Plus+
120,000,000 - Estimated Unique Monthly Visitors