I think the answer is Instagram. Because it has a wider range than Pinterest. But the platform that is more preferable is Pinterest and is very good for businesses only a lot of people are using this application, but it hasn't surpassed the user range of Instagram.
I choose two, pinterest, it seems the best site to present my interests and my favorite pictures, many friends and madness.
Instagram have not used yet, maybe in the future we have to try this site, but do not attract me very much.