Erik Qualman’s Socialnomics blog lists some pretty interesting social media stats.

For instance:

- 1 out of 8 couples married in the U.S. last year met via social media

- Years to Reach 50 million Users: Radio 38 years, TV 13 years, Internet 4 years, iPod 3 years, Facebook added 100 million users in less than 9 months… and iPhone apps hit 1 billion in 9 months

- 80% of Twitter usage is on mobile devices

- The #2 largest search engine in the world is YouTube

- More than 1.5 million pieces of content (web links, news stories, blog posts, notes, photos, etc) are shared on Facebook … daily

Read the rest here on the Socialnomics blog.