I've been birthday tagged? Is this Yahoo that's doing this?

This tagging thing asks for your birthdate and password so your friend can put you on their list. Is this legitimate?

I've been birthday tagged? Is this Yahoo that's doing this?
Don't do anything that asks for your password or any other private information. Play it safe.
Reply:it could be someone who has sign you up to it with out your knowing or it is a spam..don't answer it
Reply:This is called Phishing. Don't send out your password or your birthdate to anyone. Phishing is when someone from another website gets information and, sometimes password information and sell your information to other companies to solicit your information. No, it isn't a good idea.