Law and Facebook

I read an article from New York Times online that talked about the recent use of Facebook posts and tweets to arrest or provide evidence in legal cases. There have been many instances where a social media post has provided enough evidence to put someone in jail, or to remove them from jail. Also, it is effecting school kids and teachers. It seems that our privacy is stake more now than ever. I understand the benefits to using social media and social networking for social purposes, or to boost business, but how far are we willing to go? My question is how much longer are we going to continue to put our personal information on the internet with the possibility that it could have serious legal consequences? How many more social media site will appear before the public starts to get concerned?