To make your profile invisible for visitors and other users of service, login to the site using your username and password. Go to "Manage profile" box at the right and press "Suspend profile". How your profile is "Suspended". It is temporarily hidden in our database and you are unable to receive/send messages. You can activate your profile to make it available again for search and contacts by pressing "Activate profile".
What type of person you want to talk/chat?! Do you unfriend/blocked immediately the person you talk/chat when she/he missed to answer your message? Are you understanding person when someone tell her/his reason why he/she can't reply asap in your message?