1.That your job sucks
If you say this, you could be fired. Over the past, there have been several instances where employees have come under scanner for bad mouthing their job profile, employer and work environment.
2.That you hate your ex
In the event that you and your boyfriend get back together, or you and that friend you had a falling out with start talking again, you'll look like a total sucker. It's okay to let your emotions govern your thoughts but keep your feelings off your Facebook until you've started to think clearly about said ex. The important thing to remember about social networks is that although you have the option to delete your comments, sometimes it can be too late. It's immediate and someone might've laid eyes on it before your retraction.
3.That your going on vacation
You could be robbed. A recent study found that thieves scan social networking sites like Facebook and Twitter for folks in targeted neighbourhoods before they strike.
4.That you love yourself
In fact, don't give any indication that you're your biggest fan. Your followers will only think the opposite. It's the biggest barometer of insecurity. Researchers at the University at Buffalo also found that women who base their self-worth on appearance and what people think of them tend to upload pictures very frequently.
5.That your mean
Saying mean things about people can only make you undesirable -- for potential employers, dates, friends and strangers.
Source-TOI(Times Of India)