If I click on a users name it brings me to a page like lukeprog's.  In the upper right of that page I see lukeprog's karma score, and I also see a button "add to friends."

Early in my use of this site there were some authors I wanted to follow, I thought perhaps "add to friends" would help me do that. 

But since then as near as I can tell, "add to friends" has absolutely no functionality.  Does anyone out there know any differently?

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You can use lesswrong.com/r/friends/ to only see your friends' submissions.

Also, they are listed in the Friends tab of your Preferences, so you can more quickly message them or check their userpage.

If I 'friend' you, is there any way for you to tell that I've done so?

Can others see whom I have friended?

No.

No.

I just friended you. Did you receive any indication of it?

No I did not.

A useful feature, but a confusing use of the term 'friend.'

A useful feature, but a confusing use of the term 'friend.'

Indeed. You could subscribe to people as 'friends' purely because you consider them a bad influence and wish to be sure you see their comments, the better to refute and downvote them.

Keep your friends close...

In what way are you not describing friendship? ;-)

Hi mum.

http://lesswrong.com/prefs/friends/ does seem to have its moments.

It adds a "friend" CSS class to your friend's username everywhere, so you can add an user style or some other hack to highlight it. There is probably a reason LessWrong doesn't do it by default, though.