What is this new feature called places on facebook?

My profile page and settings is set up for family and friends that I know in person only. Will this have to change? Do you other facebook users like this places feature? Why or why not?

Thank You
Update: Can places be blocked by other users you dont know? And I always seem to get confused by enable and disable too. Sorry so many questions. Im just learing about it all.
Update 2: How do I block this places thing ?
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