Does anyone know what footprint does Pinterest have in the "social" sphere (considering the title calls it a "major social network")? I always thought it was j

Does anyone know what footprint does Pinterest have in the "social" sphere (considering the title calls it a "major social network")? I always thought it was just a scam to get people into their walled garden by overtaking every conceivable Google image search (to the point that "-site:pinterest.com" is my default when looking for images). I just can't imagine who are the actual users and what they get out of it?