First of all, great work on those icons! I really like them
Actually i've already used them on a design for a non-profit organization. You'll find it at www.facebook.com/fairfood/
I'd like to thank you for sharing them, it made the integration of other social media applications much more aesthetically pleasing.
And please, take a look and sign the petition while you're there, and don't hesitate to share it with your friends! It's all for the greater good