GraphicsEffects wrote Pretty nice for your first try at a partner background.
CNC: My bad first point is the colours you have used eg the reds i dont think they got well on all youtube backgrounds in my opinion. 2) The faceBook Logo Side Ways is just a NO!. Alos the main rectangle of the youtube layout maybe choose a different colour than just plain black and maybe lower down the opacity of it aswell and remove the srtoke/outerglow.

The side are not to crowded with the Brush/Grunge effect you have given it which is like in my opinion but i also dont like them ti pictures/brushes/vectors at the bottom witch ever ones thay are.

For next time i will try to add more detail into it thanks for the comment.