Embracing Twitter, as well as Google's own Buzz and Blogger, the new buttons let you instantly share individual photos. Notably absent is Facebook, which I suppose, is no surprise.
Picasaweb (or Picasa Web Albums) competes most directly with Yahoo's Flickr, which by any measure is HUGE .... although recent studies have Facebook now exceeding both services in photo (and video) uploads.
Regardless, the social ecosystem of Google just took another step.
