How to tell if your online accounts have been hacked

This regularly updated guide explains how to check login/activity and secure accounts across major platforms (Google/Gmail, Microsoft/Outlook, LinkedIn, Yahoo, Apple ID, Facebook/Instagram, WhatsApp, Signal, X, Snapchat, Discord, Telegram), including viewing active sessions and recent security events, logging out unfamiliar devices, revoking app access, and enabling stronger protections such as MFA, physical security keys, and Advanced/Account Protection; it emphasizes prioritizing email security as the gateway to other accounts and points high-risk users to specialized help.