If by link to your social networking accounts, you mean have it publish automatically, there are a couple of ways:
Twitterfeed.com. I’ve used this one for a couple years. Set it up so it cruises by your blog every 30 minutes, and then set it to publish the title, the URL, and the words “New Post:” to FB, LI, and Twitter. Be sure to use the Bitly url shortener (www.bitly.com).

Ping.fm. Ping will communicate to a number of social networks, but the only way I’ve found to automate it is to plug your RSS feed into it. Whenever you publish your blog, the new post will go into the feed, and then trip Ping and send everything out. (Use Feedburner.com to set up your RSS feed.)

Use one or the other of these, not both, or otherwise you’ll end up double-publishing to your networks.

On my blogs I just linked my Facebook account to my twitter account and then I can post on my Facebook page and it automatically goes to twitter. This does require a manual step, but I like to change the status update, so it isn’t always just the title and a link.

@drbaldwinfl If you’re looking to automatically share new posts from your blog to your social accounts, follow @erikdeckers suggestions.  I personally loved using Twitterfeed.  :)