Why I cant add Friends on Facebook?

How much friend you add so far?? Did you use some feature to add a friends.Whether group or a page. It look like FB warn you cause they suspicious with your account. I shut my old account, cause the email that I used to register have been spread to hundreds of group. Imagine having 18000 plus friend request.While the limit of the friend was 5000. So I shut my account and send feedback to FB about it.

it' happened to me too before. I bet someone has flagged you, so you can't add your friend :)

This happens with those accounts whom facebook thinks to be suspicious. I think you have made a new account and are adding strangers frequently. Or perhaps a couple of people have reported some sort of report about you. So thats why its happening. One thing you can do to escape it(hopefully) is that verify your account with your cell phone number, so that facebook comes to know that you are not a spammer or a robot or anything like of that sort and hopefully this problem wont continue. take care.

I guess their profile is in private.