"Privacy has always been important to the services we provide, and now it's even more central to our future vision for social networking," Facebook founder and CEO Mark Zuckerberg said in a statement. "It's critical that we get this right, and we're going to build it into all of our systems. It's going to take time to do this properly, and I expect it will take us longer to ship new products, especially while we're getting this up and running."