Celebrity·Posted on Mar 2, 2012The 25 Most Depressing Justin Bieber Birthday TweetsYesterday Justin Bieber turned 18. Here's a collection of tweets from his fans that weren't too happy about it. #saddayby Matt StoperaBuzzFeed StaffLinkFacebookPinterestTwitterMail 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25.