Do you know any polyamorists?

You hear about it all the time on TV as if it's the most common thing in the world, but I don't know anyone who practises it, nor do any of my friends. I assume it's actually very uncommon, especially long-term, but because it's such a taboo idea to most it's talked up a lot in media which can give the impression of it being commonplace.
Which begs the question - do you know anyone who actually does it? Did you know anyone who did it for a bit and then changed their mind?