Your friend knows your password — you told them ages ago, when you trusted them completely. Today you found out they logged into your account and sent messages as you. A joke message to someone, maybe, or something that started an argument, or a comment in your name that you'd never have made. People think you said it. Your friend thinks it's funny, or no big deal. But it's your name, your account, your reputation — and someone else has been wearing it without asking. You're not even sure what else they've sent or seen. Someone has been pretending to be you, using your own face.