Regardless of how you try, it's pretty tough to keep all your photos in one place. Even if you have one central hub, you probably have a few scattered across social networks. On top of that, you can't control where your friends post their photos. Pictarine takes all of that data and puts it in one place.
To get started you just sign up and start adding your various accounts. Currently Pictarine supports Flickr, Picasa, Facebook, Instagram, Twitter, Gmail and Yahoo. Once you add accounts you'll instantly see your account populated with your photos. All your albums will be in one place. If you add any social sites, you'll have a section for your friends' photos as well.
Pictarine's interface makes it really easy to move from album to album so it ends up being a great way to take a quick look at what your friends are up to without wasting a bunch of time navigating through various sites. In addition to viewing, you can actually upload photos and create new albums (on services that allow it) directly from Pictarine. If you're frustrated with dealing with a bunch of photo sharing sites, this is a great way to centralise everything very easily.