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In this chart we see the growing number of employers checking the social media accounts of potential hires. The numbers have gone from 34% in 2012 to 51% in 2014. This means as social media is becoming more and more prevalent, employers are using it to check up on candidates. Employers actually reported rescinding job offers due to disturbing content found on social media accounts. This should be a warning to everyone on social media. Employers are looking, so watch what you post.
With social media playing such a central role in people's lives, it only makes sense for employers to try and catch a peek at applicants' online personas. If applicants don't have the good judgment to portray themselves decently online, chances are they may bring some less than desirable qualities to the workplace as well.
I completely agree with Peter. A person's online persona says a lot about their personal conduct, and much of the time not for the better. Best to always think before you post.