thanks for your response ...
Some benefits of Social Networking:
You have to be careful that if you attempt to join or create a social network solely to promote your company to other members, it will most likely cause other members to denounce your activities harshly and accuse you of “invading their space".With social networking sites, the return is a bit harder to measure. But it should be a part of a larger social-media marketing effort. When used in conjunction with other tools, such as blogs and e-commerce sites, a profile on a social networking site can help increase awareness of your business online.
Collaborative /Community Tools:
With collaborative and community tools, you are counting on other people to create most of the content. For example, with a forum, you can track how many new threads are created, or how many replies are posted. This indicates that the current users are not only spending more time on your forum, but also promoting it to others.
With wikis and ratings sites, you also want to see an increasing level of input from visitors over time. Again, exposure for these sites can be greatly increased if they are used in conjunction with another social tool, such as a blog.