#45. Victoria Justice

7,135,2404,977,85090 Victoria Justice loves her fans and she never misses a chance to prove it. The singer and Nickelodeon star follows 1,109 tweeters (the 11th highest on our list), and regularly tweets back at fan accounts, helping drive up her Klout score to a 90. She also loves Instagram, where she's posted more than 500 photos.