There are a number of WordPress Plugins that appear to allow you to auto-post your WordPress blog posts to Twitter, Facebook, and LinkedIn. However, I am going with a service called dlvr.it to help me post my WordPress blog posts to Twitter.
It’s a simple matter of adding your source, in this case your WordPress Feed, and then adding and authorizing your destination account, which would be Twitter.
The UI is pretty straight forward and it allows you to forgo loading another WordPress Plugin to simply allow you to feed your blog posts to your Twitter account.