You may not be able to add someone as a friend if:
- You already sent them a friend request. Give them some time to respond to the request.
- You already have 5,000 friends. If you need to connect with more than 5,000 people
- You've blocked them. To send a friend request to someone you've blocked, you need to unblock them first.
Note: If requests you send go unanswered or are reported as unwelcome, you may be blocked from sending friend requests.