Well I came across an interesting site called twitterfeed. It basically gives you the ability to update facebook or twitter via your wordpress blog.
What is interesting is the fact that it is not a plugin for wordpress so is really easy to set up.
All you do is sign up and fill in some basic details. The main thing is entering your wordpress rss feed. This is normally just the url of your site. Once you have entered it you can test to make sure it can connect.
The next step is to link your facebook and twitter acounts. This done by just signing in.
Once complete you simply create your post on wordpress and twitterfeed will do the rest. In know time at all facebook and twitter will be updated.
Thats it. If you need to keep everything up to date and are sick of updating lots of different sites this maybe of use.