Which social networking services do you use? What do you like or dislike about them?

I have been using lots of social networking services such as facebook, kakao(Korea\'s SNS) for sharing my news or communicating with various groups, including school classmates, social friends, and work colleagues. SNS is very fast and convenient. However, there is the disadvantage that spread quickly things I don\'t want to be made public. I still work at a public company and do not want my daily life to be made public. So, from some point on, I no longer use SNS such as facebook which is accessible to everyone. Currently, I only use SNS such as Kakao Group Talk, where I create groups with only the people I want to communicate with.