If a user bothers you, the easiest solution is to block it.
To block a contact:
- Open your profile, go to the menu and click the "block user" option.
To unblock a contact, there are two methods:
- From the "profiles" tab, click on the magnifying glass and select the "I blocked him" gallery. Find the contact, open the profile and click on "unblock".
- Go to the user tab, open "my settings", and look for the option "unblock all contacts"