A good place to look, as well, in the App Store under "Social Networking." There's numerous apps in there that I've never heard of that pertain to what you're looking for...
If you use those sites, I suggest iSocialize+. It integrates fb, twitter, google+, and tumblr in one app with some neat features. It's .99 but worth it.
Pinterest;s fast growth driven by women. A lot of cool pictures over there. Just pin and share
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