Think about it though: if someone wanted to really be anonymous, would he put in small hints on who he/she is through his/her anonymous monicker? Obviously not as it would totally be a bad idea. The S-N thing is likely just a coincidence.
It's not noticed by a lot but most of the fake identity that we use to fabricate an online presence is subconsciously connected to you somehow, some might think that it's not because it's mostly words. The small hints probably aren't for the people that he'll meet online, it's probably for those close to him, someone that knows them personally and with those small hints, they'd be able to identify them, kind of like their very own secret or something like that.