ALERT: If you receive an email that looks like it's from PayPal, be very cautious.

There's a scam where a very official looking email comes from PayPal saying that your account is going to expire. It tries to send you to a cleverly masked URL that asks you for all sorts of personal information. Do NOT do this. If you need to put in sensitive information, go to the site directly and log in before submitting anything like that over the internet.