General

192,000,000[54]

Open

Blogging (formerly MSN Spaces)

120,000,000[85]

Open

Owned by Google. Popular in Brazil, India. 72% and 18% of users.

57,431,788[58]

Open (Google login)

General

50,000,000[36]

Open

General

47,000,000[30]

Open

Blogs and "metro" areas

40,000,000[87]

Open

School, college, work and the military

40,000,000[13]

Open

Schools and colleges

34,000,000[5]

Open

Started for colleges, then high schools, and now everyone.

34,000,000[23]

Open

Locating friends and family, keeping in touch

28,000,000[64]

Open

Video sharing and webcam chat

26,000,000[9]

Open