Social Networking or Addictive Behavior?

I am all for the advancement of communication and fully understand the benefits that sites like Facebook, Twitter and LinkedIn offer. I just see some people taking it to a level that borders addiction. While most of my Friends, contacts and followers seem to use the systems as needed, there are others that must be on the computer all day long sending 5-6 posts an hour. I also don't think that most people understand how easy it is to access your profiles and probably don't want EVERYONE to view some of the things that they post on their pages. It is a fact that Company Owners and Human Resource personnel are scanning these sites to gain information on current and potential employees. I have friends on facebook that I know have jobs and must just keep facebook open all day while they"work". Is it really that important that we all need to know that you are going to lunch again today at @12:15? I usually check everything out first thing in the morning and again in the afternoon. If I have something important to say or want to announce an event I will post to all. Mostly I hit people individually or comment on things they have posted. I don't get involved with any of the games, surveys, or "Answer these questions to find out what make and model car you would be". How often do check your favorite social network site and how addicting do you find it to be?