Having come into this enviroment mid career from another country I considered whether or not I should look up colleagues. Naturally I was interested.
I decided not to. The main rationale, I was reasonably ok with the salary and very much enjoyed the job. If I discovered colleagues doing similar work and getting paid more I would find this demoralising and didn't want to bring that into a job I enjoyed.
I do understand this knowledge could be a negotiation tactic, but 1) happiness is more important than money to me and 2) my personal experience is most companies are reluctant to significantly change salary without promotion, and even at promotion they tend to bump you up under market rate. So maybe I could have gotten more money, but at the risk of reducing the enjoyability of a job I really liked. So if you are going to announce your salary, I would suggest you do it in an enviroment where you know the other people want to hear it.
For me I've found the best way to make more money is change companies.
And side point: A bit disappointed the article had this like '“Let’s face it, it’s 2018 and there’s still serious disparities in pay based on race and gender,”"
Regarding gender I believe this has been fairly comprehensive debunked with multi-varied analysis. Once accounting for careers choice, age, occupation and personality-type etc and the commonly quoted 18% gap reduces to 2% on gender, and currently under 30's men are paid less than women.