If you're looking for a great place to share your photos, take a(nother) look at Flickr. I'm going to try using it solely for the forseeable future due to the whole Facebook/Instagram brouhaha.
Here's a blog post on the Flickr site regarding their recently released iOS app that highlights 10 tips & tricks. It's a great app that I highly recommend. They're even giving away free pro accounts for 3 months if you sign in before the end of the year.