Do you have any friends or acquaintances who are less than faithful to the truth?

What I am talking about are not outright liars but people who seem indifferent to whether or not something is true. I have run into people like that. Sometimes they will come up with something to make a good story. What happens is that you place extra skepticism on just about anything they say. It seems to me that for those who know them, these people lose more than they gain by their behavior.

There was a philosophical book written on this with the appropriate title of On Bullshit http://www.amazon.com/Bullshit-Harry-G-Frankfurt/dp/0691122946/ref=sr_1_1?ie=UTF8&s=books&qid=1240417471&sr=1-1 .
BS is the name the author gave to what I am describing – not lying so much as indifference to truth. He is of the opinion that BS is rampant in our culture. I wonder how our modern culture stacks up in this regard to cultures of other places and times.