Hehe, don't worry, I don't keel over so easily. It's all in good fun. I just think it's annoying to have a 50-line post quoted in its entirety, when the reply only refers to two of the original lines.
I'm with you on this. Sure, let people keep their list of games private if they so wish, but I doubt many will. As you say, the shelf feature is made for showing off, only you can't do that.

Yes it MUST be opt in and I don't think GOG would make it any other way, they've shown a distinctly non-arsehole approach to the site which not only does them credit but also smells less.

I'm sorry, but you are still missing one key point: you chose to participate in the community features and regardless of whether or not you can opt out, you were told up front what information would be made public, yet you participated anyway.
No. You're missing the point. With all their other betas Valve set the precedent that they were opt in AND opt out. Thus, people were led to believe that when they opted out of the beta, their profile would also be deleted.

How i can change avatar?

Why? Such a feature seems to only serve stalkers...

Ffrom the dropdown menu: Account->Settings->click on your current avatar

By not resurrecting zombies, you damn necromancer. :P

LOL didn't even notice he necroposted a 2008 thread

Hmmm the delicate smell of necromancy..... tasty....

Are you aware you're responding to a post from 2009? Damn thread necromancers...

Damn you necromancers for making me look stupid. :P

When you go to your account you will see the avatar. If you move the mouse over it, there will be "Change avatar" click on it to change the picture
And even it is a real longtime necro, it is still a valid question :D