Social Media Optimization (SMO) is a concept that company marketing executives are now taking seriously. The viral marketing capabilities of social networks, platforms, and social sharing can have a dramatic effect on the overall content and search optimization process.

Ning has done a great job in balancing the right social networking features for people interested in creating social networks online. The Ning.com website allows users to create their own social networks for anything and set public or private permissions on each specific network.

CollectiveX is an innovative social groups platform that solves a key problem present in other social networking and profile services. The collaborative platform allows each user to create their own network of groups and share the events, discussions, files, and objectives specific to each group.

The StumbleUpon service is a bookmark and social networking framework that suggests new sites you may be interested in seeing based on your interest and the interests of other StumbleUpon users.