Actually you don't need to use desktop version. It tries to make you install it, but if you just click back to exit Play Store, and on the FB page to prompt the

Actually you don't need to use desktop version. It tries to make you install it, but if you just click back to exit Play Store, and on the FB page to prompt the installation there's a faint X that you can click. At least it works in Opera Mobile. Interestingly if I leave the tab open I also get notifications if someone responded.