I get the blank page show up when I sign in with facebook.

Hi Saovry,

This is cURL issue, please make sure your cURL already set well.. ;)

thank you

I don't know what is cURL but could you tell me how could I set my cURL already well?

I suggest you contact your hosting provider and make sure curl enable, also please check library open_basedir as well .

Before my problem is fix after I contact my hosting follow your idea.
but now the problem come again after I re-install new site on my domain.
Could you check it? the problem is the same or what?

this issue same with that before, caused by cURL or open_basedir, and I get this error "Error: 7 couldn't connect to host"

I got this message from my hosting

Curl and CurlSSL are installed by default on our servers. The PHP open_basedir feature is enabled by default.

but my problem still not solve...

Hi,

Do you remember how to solve the prev issue? because the issue is similiar, caused by "Error: 7 couldn't connect to host"

thank you

I just contact my hosting follow your suggestion to tell them curl and open_basedir enable and I don't know about other things.

This is related with your server configuration, not on Jomsocial code.. please you contact them and making sure access IP Facebook from your server is not being blocked