When you hover over a username (on a comment or story) - it will show a little dialog which lets you follow the user:
This will also show on your profile and the person you followed will be notified on the little bell icon at the top navigation bar. The plan is to make a home feed tab to keep track of what the people you follow are doing The same applies for communities!
Rubber-Ray avatarLevel 11

I could have sworn there were comments in this thread.

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