||Go to this website for free furni||

Sometimes people will give you an address and tell you go to it for free furni. It will ask for your username, pass, and email. If you enter that info, it will send an email to the scammer and they will have access to your account in no time. Anytime you see someone say that, report them to the call for assistance.

||Ctrl+N / F11||
If someone tells you to press ctrl+n or f11and give them the address in the URL box, don't do it. With that URL they can have access to your account.

||2x Furni||

This scam is a very old one. A person will claim they can "duplicate" your furni or "double" it but this is just a scam. They will tell you to give you their furni and once you do, they run off with it.
(There is one possible way to do this, see cheats)