If you don't know what Pinterest is, good. Keep it that way.
But if you're really curious, it's a type of social media in which people (mostly women) share photos, stories and videos of interest with each. For example, Mitt Romney's wife Ann shares granola-based recipes on her account. Don't ask why.
President Barack Obama joined Pinterest last month but started sharing ("pinning") content on Tuesday. What's he pinned so far?
This chubby hand with fingernail designs that spell out "Obama."
This random Boston Terrier.
This photo of Obama wielding a light saber while a boy looks on in confusion.
See more of Obama's pins here.