NOSTALGIA

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Across
  1. 1. hit song by Justin Bieber released 2015 (5)
  2. 4. song released by f(x) in 2011 (3)
  3. 6. the cognitive ability to encode, store, and recall past experiences (8)
  4. 8. similar to styles, fashions, etc. from the past (5)
  5. 11. social networking website from Nickelodeon show 'Victorious'
  6. 12. security mechanism used by websites to verify you are a real human
Down
  1. 2. online video sharing platform owned by Google
  2. 3. popular sandbox game released in 2009
  3. 5. the longing or affection for a period in the past (9)
  4. 7. popular 2016 slang term (4)
  5. 9. popular social networking service released in 2003
  6. 10. where the ___ at?" lyric in 'WE LIKE 2 PARTY' by BIGBANG