I think you can meet people that can help your online business in both social media like Twitter and Facebook groups, as well as in forums like Webmastersun. I even met someone on a failed Flippa auction, which became a lucrative conversation for us both! I encourage you to strike up conversation, friendly and good natured, and help each other if you have something you can give.
For example, if you're strong in keyword research and you see someone on Twitter struggling with their blog... help out. You may find that they have some missing link of information you needed, or you can simply build a good relationship online with the type of people that will later become customers for you.
Hope this helps.
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PS: samimnoorzaitgc is right, social media traffic can be slight initially...but it does grow in time if you add on steadily and slowly.
Here's an example of social media traffic on a starter branded Twitter account linking back to a website:
2% of traffic is coming from Twitter for this site. It may not mean much, but if those visitors later purchase a product - then it was well worth it reaching out via social media.