Imagine walking into a bookstore, opening the Facebook app on your smartphone, and immediately receiving a notification that — lucky you — there’s a book reading scheduled to happen there in a few minutes, and that your friend Bob posted about the new book he bought there the other day. That’s exactly the nearly-creepy scenario Facebook is envisioning with its Place Tips program, which, after testing for the last few months, is rolling out to more businesses in the U.S., Facebook said on Monday. It’s also now making its beacon units available to businesses who wish to use them in their stores for free.