Android Facebook app 2.0 and IPV6

Currently I have a 6to4 tunnel via SixXS. My ISP doesn't support IPV6 yet and this is a great way to experiment with IPV6 but.... There are some Android apps which do not like IPV6. Ever since Facebook updated their app to version 2.0, the app was completely useless. No or real slow updates, but even apps like Friendcaster of Hootsuite were failing in speed. After fiddling with MTU size, Firewall settings, etc. I switched my tablet over to my Guest WLAN which has no IPV6 configuration and voila there was the apps were back on track speedwise. So if you have problems with the Facebook app, disable IPV6 or create another IPV4-nly segment.