The information age has brought many a synergistic boon, but not the least of them is this one.
I happen to work for a 40,000+ employee corporation. We hire a non-trival number of consultants annually, let alone regular employees, and in many areas. Let's say Joe Chromegoic applies for an advertised consulting position. If his resume is in the ballpark, the next thing I do is type his name into Google and see what there is to see.
Sure, I'll see some technical stuff. It may be very impressive to those in the know. But if I had the technical skills to evaluate it, there's a rather good chance I wouldn't need to hire in the first place. What I can evaluate is general intelligence - and that's where the public fora come into play. I figure if someone has an IQ even slightly above the reptilian, he or she will realize that the ability to work with other people is prerequisite in a corporate setting. Ad hominem attacks, smacking down the little guy, temper flare-ups, show-boating - not hiding but actually flaunting these on the public record is simply a wonderful give-away as to the intelligence level of many whose resumes might otherwise sound promising.
The GI tract has two main orifices: the anterior and the posterior. Slowly but surely evolution is selecting for those who use the anterior orifice for communication. It won't be in our lifetimes, folks, but one day...