try link2sd app.. if ur phn is rooted u can convert any app to system app but some apps may misbehave and maynot work properly

hello... i can't login to facebook through opera mini android, it says
You tried to access the
address https://
m.facebook.com/?_rdr , which
is currently unavailable.
Please make sure that the
Web address (URL) is
correctly spelt and
punctuated, then try reloading
the page.
but it opens through dolphin browser & android's stock browser.. Any solutions please??