Social media icons

I see quite a lot of creative interpretations of the fb/gplus/twitter whatever icons to suit the style of the site that is using them.
Does anyone know the legalities of this? Is there an approval process for the different icons?
I’d think getting one approved would take forever.
I love google but getting help or an answer out of them is a bit like navigating a labyrinth w/no exit.

I don’t know about the others, but Facebook is very clear that you can only use their “approved” icons. (Although, as you say, very many sites seem to ignore this and take a more creative approach.)

Thank you TechnoBear!
guess the rules are there in case they need to enforce them

This discussion ended in May, closing.