I have soo many issues with Facebook - I think the usability is dreadful - for example the actual amount of screen real estate used for 'actual' content is tiny, the IM windows are tiny and hidden away in the corner, every page looks the same, I'm still not exactly sure what 'my wall' is, and the difference between that and my 'home', it is also very unclear if a message is available to everybody or an individual, also getting a simple list of your friends seems to be almost impossible - you click 'friends' and you are taken to a page that does not contain your friends. And I wont even get started on picture uploading/sharing

Facebook just seems to be an extremely complicated bulletin board. Can't the world just use gmail and picassa!?!? I must be getting old... :-)