Yeah the 770 has some issues with connectivity.
Solving them requires some small study and application of it.
But in the end it is easier than the following...

As far as installing apps offline.
As I mentioned ...keep in mind ....gronmayers meta cat. ...
other than that...
you still can go into the downloads section of maemo here...
on your win7 pc...
pick the apps you wish...hit the big green obvious download arrow...
and save the app to your pc...then transfer it over to your 770 via usb.
If you feel adventurous and wish to try more demanding apps which require dependencies which are not included with the app. ...
there are plenty of methods to achieve what you need to in round about ways.

If you need your fb fix right now.
and you just aren't interested at this time in spending the time...
here you go
https://fbreader.org/content/maemo