I don't think "Add a friend" works on my profile! Melde ein technisches Problem

I added several friends, then someone wanted to add me as a friend. Each time he clicked "Add a friend", it went to a different page and froze -- never worked. I have not received any requests for friendship. Now, the "Add a friend" line no longer shows on my profile page. I am wondering if that feature works on my page?

It means that you are probably already friends with this person.