While it's impossible to send information at speeds that exceed c, it should be possible to bend the spacetime (e.g. using worm holes) so that the information would appear to have traveled faster than light.
Wormholes, it should be noted, are "possible" in only a rather remote sense. If you put a wormhole into the equations of general relativity and say "Hey general relativity, is this a valid solution to your equations" it'll say "Uhhh, sure!". But then if you ask it how to arrange masses in order to actually get that solution it'll say "Haha, you can't do that."