Today I started using a service that I have found to be very useful. It's called Ping.fm. Basically it allows you to sync multiple social network accounts, such as Facebook, Twitter, LinkedIn, Tumblr, Flickr and more. You can also send an SMS or email to Ping.fm to set your status on your connected networks. This even works with Skype and Google Talk.
I am still getting used to the service, but I have really found it nice to be able to post on all of my networks at once!