I recently signed up to Google+. It's very much like Facebook on the service, but it is Google taking on alot more than just Facebook, LinkedIn, Twitter, and Flickr are also targeted with Circles, Sparks and Picasa integration respectively.
From a photographers perspective, taking on Flickr is brave, I've been using it for years and it is excellent, but Google+ is offering a couple of really nice features right out of the beta box.
Firstly, navigate to a photo and click on Actions>Photo Information and it brings up the exif information for that image, along with the histogram. Its a nice feature, easy to implement as the file is providing all that data anyway, and one that's only really of interest to photographers.
The second nice feature is the way the images are laid out in your galleries. Its not a big thing, but rather than the utilitarian squares of Facebook, or the frankly awful approach Flickr have taken of massive amounts of white-space, Google have made a little patchwork with the main image dominating the space.
Both these features to me give an elegance and simplicity to Google+ that has been missing from other options out there.