[anysz]

Stack Overflow is definitely the best way to understand life through other perspectives

[eatbitseveryday]

SO = Significant Other, i.e., a partner.

[ak39]

It makes more sense calling Stack Overflow "SO" than calling your spouse that.

[eatbitseveryday]

Depends who spends more time with you in your life ;) I'm with my SO more than I read the website, for sure (which is minimal or rarely).

Also, the term "significant other" can mean more than spouse (which implies marriage): [boy|girl]friend, life partner, close-friend-kind-of-person, etc.