CNet via TechCrunch notes:

Market researcher ComScore reported that LinkedIn's unique visitors rose to 7.7 million, a 22 percent increase over December. And not only are more people visiting LinkedIn, but they're hanging around longer as well. Total minutes spent on the site last month more than doubled from December to 96.8 million, according to TechCrunch.

 Relationship network capitalizes on change in the environment. In a very similar pattern, facebook built up its initial membership among students who moved from high school into university environment. Nowadays, many professionals find themselves involuntary moved from industry jobs to unemployment rolls.