“Web 2.0 tools can be broken into two camps. Those which are free and those which are paid.

What makes Google, Ebay, Craigslist, and Referral Key different from Facebook, Linked In, MySpace, and Twitter?

The first group are examples of online services that may have free features, but the crux of their business is based on providing a service. These sites are different than free networking sites as there are actually services being rendered and therefore services being paid for. Even a site like Referral Key which is a business networking site for referral marketing, provides clear and distinct services.

Generally, when people log off of Facebook, LinkedIn, or Twitter they don’t think, “Ah.. services rendered”. However, they can say the same for others: “Referral Key helped me generate some sales leads, purchasing Google ads helped attract some web traffic, I was able to sell my stereo on Ebay, found a new  employee on Craigslist…”

Read this article from Referral Key.