Facebook is very good and trust website but in Facebook also you can find a lot of scam,spam,fake messages as well.Everyone need to be careful with their Security and privacy setting.
Also when you give access to some applications you need to be very careful to who you will give this information.
Great Site Good Customer experience
Serious privacy issues because of the huge amount of personal data hoarded by Facebook. This data is readily available to applications and exploit scripts and can be easily exported/exploited. (I have personally experienced a 'drive by' hijack of my e-mail account triggered by an exploit script on Facebook). Be VERY careful about data you supply, even to Facebook's own applications such as Friends Finder - your e-mail contacts, e-mail account ID and password will be squirrelled away...
Only reason this is bad... it is addictive. I have a wife (or at least had) and now I come home from work to find her playing Farmville instead of greeting me at the door or saying hi or even preparing dinner. Not that I have a problem making dinner, but when Facebook interferes with daily and regular functions, it worries me. The site is useful though.
Man hört viel über Faceebook, gutes und schlechtes. Wenn man auf Faceebook unterwegs ist sollte man vorsichtig sein was man tut (wie überall eigentlich), jedoch gehts heute ohne Facebook auch nichtmehr, jugendgruppen organisieren sich, freundschaften werden geschlossen und vertieft ect.
Am besten stellt ihr die Privatsphäre-Einstellungen auf so "geheim" wie möglich und postet nicht zuviel von euch, lieber zu wenig als zu viel!