Cannot seem to figure out how to change the notification sound that you get after the droid has downloaded an update to an application or after downloading an app.
do you have the latest version of flash installed? and try changing the browser version to desktop (assuming thats what your on FB on, if ur using the app, it still has a lot of bugs)
and all notification tones are through settings. id just go though that. but i never had tones for those..
I have the same problem with facebook videos on my Evo, make sure you have the latest flash player, if using the app there are just alot of bugs, or sometimes video formats the phone doesnt support.