Twitter could also work for jobs since the entire premise of the self-styled information network is to create a record of public posts. Google+ could perhaps fall into a similar category to Twitter since, in my experience, many people freely connect on Google+ with strangers who have shared interests. I wouldn't share family photos on Google+, for example, even with my private family circle. That's an activity I reserve for Facebook.
I guess it's too much to ask employers to refrain from seeking out our profiles on Facebook, Google+, and Twitter to check up on their prospective hires. So it's up to us as individuals to make sure our more peculiar or embarrassing sides are well hidden from prying eyes by keeping our privacy settings up-to-date. Or maybe by not sharing so much of ourselves online in the first place.