How does Foursquare make money?

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Tags

1. #location
2. #entire
3. #people
4. #company
5. #pretty
6. #check
7. #amount
8. #based
9. #going
10. #money
11. #position
12. #great
13. #foursquare
14. #there
15. #given
16. #ability
17. #obvious
18. #where
19. #advertisers
20. #network
21. #exact