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Font awesome is good. But however for 16px or less than it, the are not very crisp/smooth.

I know the question is old but just for reference...
Brat is right, you MUST use the official logos. Usually there are dark and light patterns provided.

https://twitter.com/logo

https://www.youtube.com/yt/brand/using-logo.html

https://www.facebookbrand.com/

https://developers.google.com/+/branding-guidelines


...and so on. Don't use iconfinder or other third party social media icons, you'll break guidelines.