It was most famous in the 2000s!

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Across
  1. 3. First Black U.S. president
  2. 5. Streaming era begins
  3. 7. Once-popular social site
  4. 10. Pop star’s 2007 meltdown
  5. 12. Social media explosion
  6. 14. "Games" dystopian series
  7. 15. Potter’s magical journey
  8. 17. Motion-controlled gaming
  9. 18. Bestselling "Code" novel
  10. 19. Business networking site
Down
  1. 1. "Very nice!" comedian
  2. 2. "Lose Yourself" rapper
  3. 4. 2009 box office hit
  4. 6. 2007 tech game-changer
  5. 8. Video-sharing site launched
  6. 9. Green animated ogre
  7. 11. "Poker Face" pop star
  8. 13. "Single Ladies" singer
  9. 16. Vampire love saga
  10. 20. Portable music revolution