Resume's and web 2.0

I read a few articles recently about resume's and how to put together one that looks professional. The article I was reading brought up a good point, with social media becoming so expansive it's easier to find information about a person online than it is to learn about them from reading a resume. A few weeks ago at my work I had to fill a position that opened up and I requested resume's and cover letters from the applicants. I was amazed at how a resume could position a person and then when they showed up for the interview I felt like I had been tricked somehow. More important than what a person has done, I want to know what they can do and how they will fit in to the work environment that currently exists. I feel like hiring managers can get a better understanding of those qualities by looking at social networks and information online that is more candid, rather than staring at a piece of paper.