If you've set up Twitter and Facebook profiles for your business and have used them for any length of time, you may be getting annoyed at the constant hassle of changing from one service to the next to post the same update or link. Why not link them together?
It is really easy to do, both the right way and the wrong way. It might be tempting to just use Twitter's Facebook app so that you can send updates to Twitter from Facebook, but this leaves an ugly fb.me short URL linking back to your Facebook page. This can get really annoying really fast.