If you have a website that selling products or services (as opposed to a content site that depends solely on advertising revenue), you may find it a little bit easier to use social networking sites to your advantage. This is because, if you wish, you could do product or service spotlights. Each day, week, or month, you could showcase one of the products or services that your website sells. This could either be done through status updates, Tweets, or blog posts.
If you are using your online website to make money with advertising programs, such as affiliate programs or Google Adsense, you may need to approach social networking websites in a different matter. Since you will not necessarily have a particular product or service to focus on, you will need to approach these websites as if they were personal websites.
As with all other types of online websites, social networking websites should help to increase the number of page views your website receives. In most cases, more page views mean more clicks -- which means money for you.