To most friends/family who try messaging me I appear unavailable as if I've blocked them & I haven't. I can send messages to anyone but only 3 people are able to message me. For everyone else the typing box is gone and replaced with, "This person is unavailable right now." I've contacted support multiple times but haven't received feedback and the problem STILL persists after a month. I really like fb messenger, but there's no point keeping the app installed if it doesn't function properly!