How can I get more prints for free?

Related questions

1. Can I print photos straight from my phone?
2. Is there a limit on Shutterfly?
3. Is Snapfish or Shutterfly better for photo books?
4. How much do Apple photo books cost?
5. How much does free prints cost?
6. Does shipped mean delivered?
7. Where is Snapfish based?
8. Does Apple still print photo books?
9. What does it mean when your order is in transit?
10. What is a good printer to print photos?

Tags

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2. #bonus
3. #friends
4. #family
5. #means
6. #order
7. #sharing
8. #which
9. #month
10. #individual
11. #twitter
12. #inviting
13. #prints
14. #photo