As it's said on the homepage and as the name suggests, Överallt will work (almost) everywhere, so there is no point for me to show it to you everywhere I've tried... But here are a few screenshots, just for you to see how magic it is ;)

Overallt / Flattr on facebook
Facebook

Overallt / Flattr on twitter
Twitter

Overallt / Flattr on youtube
Youtube (comments here)

Overallt / Flattr on blogger
Blogger