In SharePoint 2010, there is a new social collaboration feature on a person’s MySite called "Interests". SharePoint matches content that is tagged by other people with tags you enter in your profile. In the technical preview, the only way to edit the Interests profile property is through Central Administration.
The profiles screen is no longer under Shared Service Providers. It can be found under Application Management | Manage Service Applications | People | Manage.
Under Manage User Profiles, edit the user’s profile.
Once you’ve entered tags in your Interests profile property, your MySite will start receiving matches.
I’ve found that the scope of Interests goes beyond your Colleagues which is the default web part below Interests Tracker. You’ll also notice that tags in SharePoint 2010 can consist of multiple words. Use the semicolon to separate tags, not commas.
