72% of online adults use social media.
42% of online adults use more than one social media site.
89% of 18-29 year olds use a social media site.
72% of 30-49 year olds use a social media site.
60% of 50-65 year olds use a social media site.
43% of 65+ year olds use a social media site.
There are 1.15 billion Facebook users.
There are 1 billion Google+ users.
There are 550 million Twitter users.
