Comcast one of the biggest communication companies in the world invests in social networking. Comcast delivers broadband internet services, digital services and broadband phone service. By acquiring Plaxo, they can bring the social network to different devices and platforms. Comcast also focuces on commerce and content, the Plaxo network can offer professional content and extend their services for the Plaxo user.
Another example of the trends we see within the social network community (mySpace, bebo)