Dear Maintainer,

I'm pretty sure that the facebook, google, flicker etc. icons/logos are
tradmarked which would make them non-free

see also:

*
http://commons.wikimedia.org/wiki/Commons:Copyright_rules_by_subject_matter#Trademarks
* http://smallbusiness.chron.com/can-alter-trademark-logo-use-38956.html
* http://www.google.com/permissions/using-the-logo.html
* https://www.facebookbrand.com/dos-donts