Originally Posted by doogald
You can try to uninstall in settings->applications->manage applications. Wait for the list to refresh, then tap on Facebook and there should be an uninstall button on that screen. Also, after you let manage applications refresh, you can press menu and choose "sort by size" to get an idea about which apps are consuming data.
Thanks Doogald, but I am already past that point.
I frequently go to "settings->applications->manage applications"
and clear caches after I sort by size.
For the "Facebook by Android" app there is of course the "clear cache" button, but then there is only a "uninstall updates" button, but no option to uninstall the app itself which is very odd.