Let people say what they want about Twitter and the impact of Social Media on websites, but there is a real impact these sites can have on your blog or website.

Last weekend I created a Twitter account for That's What She Said.  I then configured the site to post quotes as people post them directly to Twitter.  That alone I saw a 14x increase in traffic over the next few days. Next, I created a hourly job that searches Twitter for relevant hash tags and follows the users that have posted with the hash tag. This step bumped up my traffic an additional 4x. 

Starting two days ago I also began seeing my natural search clicks increase by 20x.  The new "real time" search on Google has been sending me a good portion of that traffic.

It's also worth noting that you shouldn't be "spammy" with how you post your links.  You need to do it in a controlled manner, as in, 1 or 2 tweets an hour.  You want to give your site presence to your followers without spamming them.

All and all I spent about 4 hours on making the changes to that site and reaped pretty huge rewards almost instantly.  From an ROI standpoint that is very promising, I've seen about a 50% bump in clicks on ads as well.