Facebook is a multi-billion dollar company with world-class security. It is impossible for a random, free website to bypass their encryption and firewalls just by entering a username. Real vulnerabilities (called Zero-Days) are worth millions of dollars and are not given away for free on public websites. The Risks of Using These Sites
Since "hacking" is mostly done through tricking users (Social Engineering), protect yourself by: melhor site para hackear facebook gratis
Some "hacking tools" are actually phishing pages. When you enter the target's profile URL, the site might ask for your login details to "connect to the server," effectively hacking you instead. Why Real Hacking Isn't "One-Click" Facebook is a multi-billion dollar company with world-class