This has happened to me 3 or 4 times now, and I don't know how they're doing it. Random Facebook friend creates a business, and then adds all of their friends to the page.
Not an invite to like it... you're just added.
The notification this time says:
Blah Blah started Blah Blah Page. They added you and other friends from their profile.
How do they do that? My pages only offer for me to send out invitations.