Why if I may asked? Non technical people don't care, and I've gotten recognition by some hiring engineers by it. One even started an interview with "I gotta thank you, your SO answer helped me out recently".
As a hiring manager I can tell you the sad truth about this and github links.
No one reads them. Seriously. No one reads them. There’s simply too many resumes to look at. Having it something extra to look at, and it’s cognitive load is a hell of a lot more than anything else, because now I’m supposed to understand some random code dropped in my lap, or whether some rando’s answers on SO are quality, or not. (Points just tell me about how quickly it was answered, not necessarily quality.) Finally, assuming I did all that work, now I have to compare this to someone that didn’t list it, because they don’t care enough about SO to create an account (raises hand), or simply have hobbies outside of coding.
It’s easier — and fairer — to simply judge the resume based on the the actual resume, and then follow up with interview questions if appropriate.
Personally I've looked at it, even if very briefly, almost every time it appears on candidate profiles.
One of the most important traits I look for in mid or senior devs is the ability (and eagerness) to explain and teach complex concepts to people who don't have that expertise yet. Bonus points if they also do this in a rapid, friendly, and humble way themselves.
