Twitter
Tools for Marketing your Restaurant on Twitter
Sign up for a Twitter account. Publish your Twitter profile on all documents. Promote giveaways, specials and announcements via your Twitter profile. Use it also as a tool to listen and converse with your customers.
You can also use Twitter to host "Tweetups" for your Twitter community and Meetups for those that gather around topics via meetup.com
How to Use Twitter for Marketing & PR
Ideas and a Step-by-Step Guide using Twitter as a marketing and PR tool. Made for "micro-blogging" or posting very short updates, comments or thoughts, Twitter is a great way to get the word out about your product.
http://blog.hubspot.com/blog/tabid/6307/bid/4034/How-to-Use-Twitter-for-Marketing-PR.aspx
137 Small Business Twitter Tips
Answers to these questions: How To Getting Started, Smart Marketing, Observing Etiquette, Spreading Your Message and Advanced Strategies.
http://smallbiztrends.com/wp-content/uploads/2009/07/smbiz-twitter-tips-2.pdf
http://smallbiztrends.com/2009/07/137-small-business-twitter-tips.html