Hi!, social networking can really help grow a business. It’s a great a way of promoting your business and to help get the kind of exposure your business need. I’ve come across so many helpful websites that share info on different social networking sites that can be very helpful in marketing a business. Here is a list of some social networking sites:

1. Facebook - http://www.facebook.com/ (One of the ultimate sites in promoting your business)
2. Twitter - http://twitter.com/ (Another very well known social networking site that can be used to help promote your business)
3. Fast Pitch - http://www.fastpitchnetworking.com/ (A network where can market your business and make connections)
4. Biznik - http://biznik.com/ (A community of entrepreneurs and small businesses dedicated to helping each other succeed.)
5. Ecademy - http://www.ecademy.com/ (Business network for creating contacts and sharing knowledge)
6. Upspring - http://www.upspring.com/ (Networking site for promotion and social networking)
7. Wikihow - http://www.wikihow.com/Main-Page (Can create a how-to guide or tutorial on this site to share your company’s services with the public for free)
8. Ziggs - http://www.ziggs.com/ (Can join groups and make contacts through your Ziggs account to increase your company’s presence)

For so many other social networking sites and more info on how to use social networking to promote your business, can check out the following websites:
http://www.insidecrm.com/features/50-social-sites-012808/ (One of the best sites I’ve come across that list many social networking sites)
http://blogs.sitepoint.com/2009/07/28/social-networking-sites-for-business/
http://www.ehow.com/how_2289008_use-sites-_to-business-grow.html
http://www.techrepublic.com/blog/10things/10-ways-to-use-social-networking-tools-to-promote-your-business/1760

I hope I’ve been of help!