If you use Chrome, here's a salutary warning. For a while I've been mildly wondering why I was the only one who couldn't Follow (or, as it's now been renamed, Friend) another user. The Jive Help section was quite explicit : there's a button to do this on a user's profile page. Except that, for me, there wasn't.
It turns out that AdBlock Plus wasn't being honest about what it was blocking. It said nothing was blocked on the profile pages, but when I switched it off (and whitelisted the whole Community for good measure) the Add As Friend button magically appeared. So, if you have browser add-ons and something isn't quite right with the way the site is displaying or behaving, try switching off those add-ons that modify a webpage's appearance or behaviour. They sometimes have unexpected side-effects.
The buttons are still here for me and I have Adblock Plus on in both Chrome and Firefox. Which one are you using? (I'm using the 4th one down)
Ooops. Slight faux pas there. I swapped AdBlock Plus for AdBlock a while back but forgot I had done so. So it's AdBlock at fault not ABP. The message is basically the same though.
... so now I have the Friend button. But here's a funny thing : I can apparently Friend myself. I wonder what happens if I do? Looks to me like this could cause Recursion (see : Recursion)