Here’s a page of helpful links.

Facebook:

• How to Use Facebook (Videos) - Great for beginners
• 10 Reasons to Use Facebook for Business
• Mari Smith’s Blog - Mari is THE expert on Facebook and Twitter. Follow her advice!
• Mari Smith’s Videos on YouTube - helpful
• Newbies Guide to Facebook
• How to Develop a Facebook Page that Attracts Millions of Fans
• FacebookAdvice.com
• Mashable – one of the main sites for news and information about social networking sites.
• Social Media Examiner – helpful articles about Social Media

Twitter

• Getting Started with Twitter – Helpful Video
• Ways to Tweet – Updated regularly
• Mastering Twitter – PDF Download (Right click and Save Target As)
• Power System Blog - Excellent Twitter advice
• Top Twitter Tools, Resources, and Services - most complete list I have seen
• TwiTip - a blog of Twitter Tips – Highly recommend
• How to Live Inside Twitter and Still Stay Productive
• How to Pickup Followers on Twitter
• The Top 10 Reasons I Will Not Follow You in Return on Twitter
• 11 Ways to Use Twitter to Help Your Site Go Viral
• 100 Twitter Tools to Help You Achieve Your Goals
• Custom Twitter Backgrounds
• How to Build Community on Twitter
• Twitter 101 for Business – A Special Guide

Applications

• Tweetdeck – Organizes Twitter. Highly recommended
• Tweetlater – Lets you schedule tweets and auto-follow
• Twellow – A directory searchable by category
• TextTally – Counts words and characters
• KeyText – Eliminates the need to retype common phrases