Vanilla Android does not have live stream widgets for Facebook and Twitter. Sense does, Blur might, and I'm not even sure TouchWiz does. So perhaps you meant Stock HTC ROMs.
Regardless, I have no interest in any of those widgets, as I choose not to use any of those services. I consider myself a rare breed of human that consciously chooses not to use facebook/twitter/myspace/etc.; and one of my biggest peeves is when people whip out their phones to post on their wall/tweet something when I'm currently talking to them. That's a sure fire way to guarantee that I'll never want to strike up another conversation with you again.