If you don't keep a good antivirus scanner and anti-mallware scanner running these days, you get what you deserve. Facebook isn't any worse than any other site on the net regardless of scare tactics to the contrary. As for your privacy, If you don't want your privacy breached, don't put it online. Even on Facebook there are things you should keep to yourself.

It's just like Windows when it comes to attackers. Windows has the most Virii and Malware because it's the largest OS and the biggest target. Facebook is likewise the largest or one of the largest social networks and will continue to be targeted by hackers/crackers/virusmakers alike because of it's size. Protect yourself properly and you shouldn't have an issue with it.