Absolutely ZERO! I'm in that small percentage of people in the world that has chosen to not be on social media sites. Yay me! Family and friends ask me all the time if I'm on Facebook and I tell them no. They try to convince me to join the site and I tell them no. I've got better things to do than be on Facebook or any other social media site.
Here is my time to spend on Socialnetwork : 1.30 minute on twitter 2.20 minute on Fb 3.1 minute on G+
I think every body have different perspective to spend time on social networking website. if you just want to chat with your family friends and if you have enough time than you can do what ever you want. but personally i use social network to grab networking opportunities and grow my business. as i said every body have their own preferences. thanks shan