The R Graph Gallery, the website from Romain François that showcases hundreds of examples of data visualization with R, has new social features. Now, when you find a graph or chart you find appealing or useful, you can “Like” it on Facebook or “+1” it on Google+. This should be a great way of highlighting the best charts and graphs in this massive collection (and don't forget they all include working R source code as well, to adapt for your own needs).
Here are some examples from the current front page:
Explore the graphs in the R Graph Gallery at the link below, and +1 or Like your favourites!
R Graph Gallery: Enhance your data visualization with R