Apparently Facebook found a smart way to make users choose www.facebook.com as their home page (the one when the browser starts, not the one stored on some obscure server somewhere on the Internet).
Why not? Facebook needs traffic, it needs to grow, and asking people to put it as home page will improve figures.
People are already spending too much time on Facebook, in my opinion (at least here in Sweden, where it’s very big). And on Facebook, you’re not really relaxing, and you’re not productive either. I don’t think it’s a very positive move (I’m not alone, Tim Berners-Lee isn’t either).
I would suggest you to put www.geotruc.net as you’re home page. You can relax watching beautiful maps, satellite pictures, and you can be productive by using it to geotag your photos on Flickr (use the machine tags for that purpose), quickly enter your destination in your GPS device…