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If you haven't heard of the Twitter or Tweeting yet, then you may be missing out. In less than three years, the micro-blogging site has 50 million users and is signing up an additional 8 million users per month. In its latest round of financing, the company sold shares valuing the company at $1 billion.

Twitter users can follow their friends, famous stars (think Demi Moore and Ashton Kutcher), organizations or companies that have a Twitter account. Twitter asks one question, "What are you doing?" Answers must be under 140 characters in length, including spaces, and can be sent via mobile texting, instant message, or the web.

This form of social media can serve a purpose, other than for amusement and time-wasting. It is also a useful tool to see what is happening in the world today. The following are some of the people AstroNutrition finds informative and can help guide you to better health:

Algaecal – This company manufacturers the only certified organic plant-based calcium product. Their product can be found in products from Garden of Life, New Chapter and other quality manufacturers.

Gardenofliferaw – this company manufacturers high-end supplements from multi-vitamins to weight loss solutions. Follow their Twitter feed for useful nutrition information and health tips.

ReserveAge – the premium provider of resveratrol, the miracle antioxidant that is getting a lot of press coverage.

Avoidthehype – this Twitter account run by Fusion Bodybuilding shares a lot of insights on product development and bodybuilding.

TeamGaspari – makers of Gaspari Nutrition, find free giveaways, tips and testimonials on their Twitter feeds.

SanjayguptaCNN – Dr Sanjay Gupta, neurosurgeon and chief medical correspondent for CNN, this man knows health, Dr Gupta tweets regularly on everything from his world travels to current events in health.

Team_Optimum – these guys make Optimum Nutrition products and their posting and musings are well worth the 140 character post.

AstroNutrition - our favorite Twitterer, by far!

So it's not all fun and games, folks. There is some learning happening on Twitter, providing you follow the right people. Enjoy!