Ranking well in organic search results and social networking sites are not mutually exclusive. There is  proven benefit to getting involved with social networks.

Creating a “buzz” about your website through a variety of means will eventually direct traffic to your site. Not everyone that finds your website does so by using search engines. Some of them are directed to your site by direct linking from other sites, forums and social networking sites. All of these inbound links are beneficial to ranking well in organic search. Don’t ever underestimate the power of networking.

Now get out there and get your site involved in social networks and be patient.. you’ll see results before you know it.