Is Google Plus a better, smaller social media alternative rather than the Big Two? How about Snapchat? I'd heard about it, but never used it. Instagram isn't useful as it's under FB ownership.
I turned down G+ because of its cumbersome URL scheme and lack of extensibility and integration; if you ask me, it's a failed attempt to dethrone Facebook.
I chose Flickr (a Yahoo! subsidiary) over Instagram because it maintains all the correct attributions professional photographers would expect (like EXIF and so on). As an added bonus, the (discontinued) AppleTV 3rd-gen has Flickr screensaver support so I can get a routine dose of kigging when I'm not: