I found next:

vk.com
1. http://vk.com/id13682096 (wrote him about btt account)
http://vk.com/nextcoinnxt (about 60 followers)

2. S3MKi
http://vk.com/cryptonxt (about 2400 followers)

3. https://bitcointalk.org/index.php?action=profile;u=217295
https://vk.com/nextcoins (about 15 )

Facebook
4. allwender
https://www.facebook.com/thenextcoin

5. Vilv
https://www.facebook.com/nxtcoinn

6. QBTC
https://www.facebook.com/thenxtcoin https://www.facebook.com/nxtcrypto

7. Ola
https://www.facebook.com/groups/NxtCurrency/

8. apenzl
https://www.facebook.com/nxtmag

twitter
9 . allwender
https://twitter.com/nextcoin
10. Ola
https://twitter.com/NxtCurrency

I don't know who is owner of twitter.com/nxtcrypto (twitted him) and vk.com/nxtcrypto