Like Shoppybag.com, Shtyle.fm is a website set up as a viral advertising scam. The website will let you “set up an account” after receiving an invitation, and then request credentials to your e-mail account – which it then uses to send out a message to all of your contacts.
What should I do?
If you receive a message from Shtyle.fm, ignore it or delete it. If you have already “created an account” with them, don’t go back. Change the password to your e-mail account(s) and mark messages from them as spam, or just delete them.