Travis Megale is happily employed. A regular Facebook user, he knows how to use the site appropriately and what NOT to say or post. Unfortunately, many Facebook members do not. Job termination due to behaviour on Facebook seems to increasingly be in the headlines. A recent survey from email security firm Proofpoint finds seven percent of organisations have fired an employee because of activity on social media sites. Another 20 percent said employees have been disciplined over social media activity. It's statistics like this that inspired Megale to launch his Facebook group "Fired because of Facebook."

"I'm a high school teacher so I have to be very mindful of what I post and I set up the group as a bit of heads up to my colleagues," said Megale. "People I had worked with in the past had made comments and posted pictures that could have easily resulted in their termination had they been seen by the wrong people. My hope is that the page will save a few people from making a silly, yet costly, Facebook mistake."

In an effort to create awareness , the group invites members who have lost their job because of something they did on Facebook to tell their story. And tales of woe about a Facebook flub that lead to a lost job are revealed regularly. Recent examples posted on the group's Wall just in the past three days include one member who said "Fired for posting "F*** them nuggets" on a friend's page. I was a manager at McDonalds for 3 years. Gone!" Another poster writes: "Fired for not being 'the calibre of person that we like to hire. What you act like in your personal life reflects negatively on us as a company.'"

While it may not make a fired employee feel much better about losing their job, there are reasons for an organisation to monitor employee social media behaviour and take action against things they deem problematic. It's often reputation and security concerns that an organisation is concerned about when it comes to social networks, some of these include brand image and employee safety.

What are some of the red flag behaviours an employer might look for in their employees' online profiles? Here are ten mistakes users make on sites like Facebook and Twitter that could lead to unemployment.

Posting negative comments about your job or your company:

This might seem obvious - but for many people it's not. Some Facebook members feel the need to vent to friends and family about their job, or their coworkers and are under the impression their profile is private. But this isn't always the case, especially if a user has failed to make their settings private, points out Tom Eston, host of the web site Users need to be more mindful not only about privacy settings, but about keeping work-related rants to themselves.

"Just don't do it," said Eston. "Often someone will post something and then think, days later, maybe I shouldn't have done that. You can't blame the social network for that. People need to take more personal responsibility for what they post."

Even if you have your privacy settings locked down, remember that Facebook redesigns can cause settings to default back to public, making the content available for everyone to see until the user goes in and resets it. This was the case with a teacher from Massachusetts who was fired from her job in August after posting on Facebook that she wasn't looking forward to another year in the district. June Talvitie-Siple, who also had called the students 'germ bags' in another update, did not realise her settings were public after a recent Facebook change. She serves as a good reminder to check your privacy settings regularly.

Then there are those who are just plain forgetful. Like a woman who sounded off on her boss in a post that has now become internet legend. Unfortunately, that boss was also a Facebook friend who could easily view her profile.

The woman updated her status to read: OMG I HATE MY JOB!! My boss is a total pervvy (sic) w**ker, always making me do s**t stuff just to p**s me off!! W**ker!"

The boss responded: "I guess you forgot about adding me on here? " and ended with "Don't bother coming in tomorrow. And yes, I'm serious."