I like this idea now available as an addon for Firefox. A little F1 button to allow you to share links and content via Facebook, Twitter, etc. all from your browser on the content page without actually opening those sites in other tabs. Read on:
Have you noticed how more and more pages on the web have 3, 6, or sometimes 12 little icons on a page encouraging you to share the link to that page with your friends? Why is that? Publishers want to make it easy for their readers to spread the word about their content, and readers often do want to pass the word about something important or silly. Still, the current model is not nearly as awesome as it could be:
First, publishers don't know which sharing system you like to use. Maybe you're a Facebook wall-writer. Maybe you tweet everything. Maybe you prefer private emails. Maybe you use some sharing service that that publisher has never heard of! There's no good way for the publishers to know, so they either pick a few, or pick a lot (leading to pages that are covered in bright little buttons), leading to web pages that are cluttered, ugly, but also not very usable.
Second, when you use a sharing service, you often don't know who has access to what data, and what they'll use it for....
More info here: http://mozillalabs.com/messaging/2010/11/10/f1/ (http://mozillalabs.com/messaging/2010/11/10/f1/)
Another reason why Firefox is still the best browser on the market right now ;D
King