It looks like Opera may have been influenced by the bookmark manager which Google recently launched for Chrome, which is a shame. That manager isn't very functional or well-designed, and more importantly I think there already is a better way to share links online.
I've been sharing links online for about 5 years now, and in that time I have cut the steps required down to a minimum. Rather than use Operas's clunky method of saving a link before sharing it, I simply use bookmarklets to share a link for whatever page I am currently viewing.
For those who aren't familiar with the term, a bookmarklet is a small bit of code which sits in your web browser's bookmark folder (or more conveniently, the bookmark bar across the top of the browser window). A bookmarklet can be made to do many things, including enabling users to share links with a minimum of effort.
Most of the major social networks, including Facebook, Google+, and LinkedIn, have released bookmarklets which make it easier for users to share links on their respective networks. (Bitly has a good bookmarklet for Twitter, which is what I use.)
If you would like to use bookmarklets, here is where you can find a few of them:
Installing a bookmarklet is as easy as dragging it to your bookmark bar and letting go.
You'll need to be logged into an account on a network, but once you've done that the process is much simpler than Opera's method. Simply view the page you want, click the appropriate bookmarklet, and a pop up window will appear and let you can share a link to your preferred network.
Assuming you don't also want to save a copy of the link, I think this is a much better method, and it's one which works on all web browsers.
But that's just me; how do you like to share links?