Google feedburner introduces new service for socialising your feed. Your post can be sent to social network from feedburner itself.
Currently the socialise feature supports only Twitter. Other social networks may be supported in future. The posts get tweet as they reach to feedburner. Feedburner uses Google’s own url short service goo.gl
To setup socialise in feedburner , Go to Publicize –> Socialize. You will see something like above screenshot.
Click “Add a Twitter account” and authenticate using oAuth.
Set the formatting options according to your taste and activate the service.
From your next feed, number of items selected will be tweeted automatically.