Instagram was famously worth about $1 billion to Facebook -- but how much is one Instagram photo worth?
A box of Special K. In Stockholm, at least.
The Kellogg brand's freestanding store offers a free box of its upgraded Special K to anyone who snaps a picture and tags it with #nyaspecialk, which is Swedish for "new Special K." Just show the cashier your pic to get the booty. Why Instagram? Jan Hedegaard, the Nordic marketing director at Kellogg, says the app is more popular in Sweden than Twitter, which is the typical home of hashtag promotions.