There are many reasons why you want to hide your online status when you’re chatting. Sometimes, you just don’t want certain people to know you’re online, which is perfectly reasonable. You’ll need to go into settings, then ‘Account’, then ‘Privacy’. In this section, you can choose who sees your ‘last seen’ or ‘online’ status. There are two options: you can choose to hide your status from everyone or just show your contacts. With this second option, anyone who isn’t on your contact list wouldn’t be able to see if you’re online or not.