Most popular social networks

1.Facebook -online social media and social networking service. ( 1,100,000,000  visitors)

2.YouTube-is an American video-sharing website(1,000,000,000  visitors)

3.Twitter-Twitter is an online news and social networking service where users post and interact with messages, "tweets"(310,000,000  visitors)

4.Google+-Google+ is an interest-based social network that is owned and operated by Google (120,000,000  visitors)

5.Instagram-

Instagram is an online mobile photo-sharing site (1000000000 visitors)