Interior design, food photography, weddings, and MASON JARS! This is how you take advantage of the strong intent to buy present in so many Pinterest users. I'll also add that putting up a board full of awesome infographics works pretty well too ;)...
If you're talking to teens or people in their early 20's, Vine is an absolute MUST. Get on there and get weird. You'll be noticed for it.
Google+ isn't just for Google employees! It's the perfect place to show off your high-res photos and... ok it's great for nerds, too.