geticon converts a social networking / website's favicon to a social icon. so, you can use website's favicon as a social icon easily.
all birds fly but twitter's is different. don't replace twitter's bird with another one.
use the original.
http://twitter.com/#!/gokercebeci
geticon is a smart webservice and you can call a social icon with dynamic urls.
ex:
http://geticon.org/of/http://twitter.com/#!/gokercebeci