I've submitted a few extra variations for you including a reversed out version on dark background and a mono/ plain version which you may need for certain printed items items (ie. pens, embroidery etc). It works well on any option as it's such a simple graphic.
Also, I thought you will probably need a favicon / icon version of just the icon which it also suits. ie. facebook/twitter etc.
Cheers,
Craig
(This comment references Entry #177)