Whilst site administrators have to go to the effort of setting up their sites to be crawled by the likes of google and other search engines. This component takes site promotion one step further, allowing users to import their address books from quite a few free web based email services as well as outlook and other computer based accounts. Doing this allows site administrators to empower their users to promote their own site, saving them time and creating a better promoted site. The component has a wide range of features, from 'Personal Namecards' through to awarding users karma points for inviting members.
If you are building a community site, this is an essential!