DDB Stockholm’s Fun Theory campaign for Volkswagen is excellent. The piano stairs viral shows how you can change human behaviour just by making something fun. Simple insight, really on brand, over 1 million views on YouTube already. Excellent work.
What Google Sidewiki allows you to do is comment on any webpage or content on any webpage. That means any user can correct information, add more useful information or links, make a comment, etc, etc.
Google Sidewiki appears as a sidebar so you can see the content alongside the page you’re browsing. There’s also some very cool additional functionality and of course it’s all on an open API so other developers can play at will.
I’d be very happy if somebody installed the Sidewiki extension and used it to leave comments on this site.