And, how is this helpful you say?
Personally I try to keep all of my work as private as possible. There is no particular reason, I'm just a private person.
Do you really want to work for a company that measures competence based on pissing-contest and attention-whoring mentality?
Exactly. Because they're falsifiable. I'd personally rather work for people who value skill, not falsifiable data.
To be fair, it's hard to qualify "skill", so shortcuts are very tempting.