1. That They Hate Their Job
The last thing anyone wants to hear at work is someone complaining about how much they hate their job. Doing so labels you as a negative person, who is not a team player. This brings down the morale of the group. Bosses are quick to catch on to naysayers who drag down morale, and they know that there are always enthusiastic replacements waiting just around the corner.

2. That They Think Someone Is Incompetent
There will always be incompetent people in any workplace, and chances are that everyone knows who they are. If you don’t have the power to help them improve or to fire them, then you have nothing to gain by broadcasting their ineptitude. Announcing your colleague’s incompetence comes across as an insecure attempt to make you look better. Your callousness will inevitably come back to haunt you in the form of your coworkers’ negative opinions of you.

3. How Much Money They Make
Your parents may love to hear all about how much you’re pulling in each month, but in the workplace, this only breeds negativity. It’s impossible to allocate salaries with perfect fairness, and revealing yours gives your coworkers a direct measure of comparison. As soon as everyone knows how much you make, everything you do at work is considered against your income. It’s tempting to swap salary figures with a buddy out of curiosity, but the moment you do, you’ll never see each other the same way again.

4. Their Political and Religious Beliefs
People’s political and religious beliefs are too closely tied to their identities to be discussed without incident at work. Disagreeing with someone else’s views can quickly alter their otherwise strong perception of you. Confronting someone’s core values is one of the most insulting things you can do.

Granted, different people treat politics and religion differently, but asserting your values can alienate some people as quickly as it intrigues others. Even bringing up a hot-button world event without asserting a strong opinion can lead to conflict.

People build their lives around their ideals and beliefs, and giving them your two cents is risky. Be willing to listen to others without inputting anything on your end because all it takes is a disapproving look to start a conflict. Political opinions and religious beliefs are so deeply ingrained in people, that challenging their views is more likely to get you judged than to change their mind.

5. What They Do on Facebook
The last thing your boss wants to see when she logs on to her Facebook account is photos of you taking tequila shots in Tijuana. There are just too many ways you can look inappropriate on Facebook and leave a bad impression. It could be what you’re wearing, who you’re with, what you’re doing, or even your friends’ commentary. These are the little things that can cast a shadow of doubt in your boss’s or colleagues’ minds just when they are about to hand you a big assignment or recommend you for a promotion.

To be continued.

I agree... But actually it is not successful people that do that.. Because in companies like facebook its is all about communicating ideas for improvement... So you are like talking to each other on almost everything up there except your salary