I prefer to spend more than 2 hours each day. I like FB because there I can find many interesting information which I can read or watch. Sometimes I can stay for more than 5 hours and there is no time for me. I just feel myself like searching for several minutes…but in reality it’s passed more than several hours…
I spend 2hours in Facebook for my personal use but I spend 2 to 3 hours if I use it for my site for SEO work.
This is not important how much time you stay on social networking sites but the most important thing is what u have done in these sites in this time.
I spend 1 to 2 hours per day. I think more than 3 hours is too much. As broadcast2world said what we should count is our input and output in these sites.
Generally much time should be given to the social site. Usually i spend 2 to 3 hours for social sites.
1-2 hrs a day doing some activity on networks. And logged in FB, Twitter, Google + till morning to late night.