Pinterest has grown from 700,000 to 20,000,000 unique users in the past year; that's already almost half the number of Twitter's users.
It is cannibalizing other social media: Compete attributed a 3% decline in Facebook activity in June to users' preferences for Pinning.
1 in 4 users spend less time on other social media in Pinterest's favor, with 15% of Pinterest users saying they don't use any other social sites.
That number's even higher, 23%, among those with an income of less than $30,000.
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http://www.marketingprofs.com/short-articles/2642/pinterests-impact-on-users-and-on-your-brand#ixzz28S4pxro1
