Wow. I don't believe I've ever seen anyone ask that one
before. I could see Captivate content being used *IN* a blog, but I
would be very doubtful that Captivate could be used to actually
*Create* and manage a Blog.
I'm not saying it couldn't be done if you wanted to do it.
But in my opinion it wouldn't be the tool for the job. It would be
a bit like chopping the roof off an SUV in order to make it
function like a flatbed truck.