The following accounts are linked
1) s1ng
2) izanagi / izanagi narukami
3) michietn94
4) xuan87
5) longtong / BAGOBO
6) lili song

Proof can be found here

What I find very strange is that 2 of accounts have changed their display names - izanagi to izanagi narukami and longtong to BAGOBO. I thought Theymos was very selective in allowing these changes...