I am half joking, but also half serious. I minimize my profile online to cut down on recruiting spam. Coderwall is a step in the wrong direction in this regard.
Companies that want to build great teams need to start thinking more offensively than defensively. If you have a great culture and solving interesting problems, recruiters wont pose a threat.
So no, the reality is not that it's easily accessible -- unless you're already making it so on sites that are liberal with sharing your info like LinkedIn.
Here is an article on Monster.com and endless email: http://blog.brusic.com/2012/07/how-private-is-your-online-jo...
"information is easily accessible on LinkedIn". Unless LinkedIn has some psychic abilities, LinkedIn only knows what I voluntarily add. My LinkedIn profile contains only company names, dates, and titles. No descriptions. No StackOverflow. Github is used to share code with those I know, not some vanity site.
I work with an amazing team, but you won't find us online (except for mailing lists or slides from talks).
It's not like you're under obligation to respond, and every once in a while a recruiter may even have a pitch that merits a response.