error when connecting to facebook

Could you try to make the connection once again?

If you still experience issues, could you try to disconnect and reconnect to WordPress.com?

problem still exist when trying to load this link :

https://public-api.wordpress.com/connect/?magic=keyring&service=facebook&action=verify&kr_nonce=27b9d2ec36&nonce=831b38eb58&state=1847764&code=AQBmuHvEDpyMH2kFmfOaXNqVlD75U2xMFPmaMaVGK5VCcKTtPcPOEnyu2cwmaFC6vczgXRh5TMy8x3-eGGsvEv2Ng8YPL8hrsM5eDP8-RuvlvZO0sRffy4FD4pSdJpnSzwTG-R9f7SHi6qpq-weW0-jE9f48QU1zSf-_I0mR5IpiE7xUjfyXDtjZalF15L1yGJu5Jn5Te4tL1nH4iz3Ij8vS#_=_

i’m using using v3.4.2 persian wordpress https://wp-persian.com/download/

Exact same problem here.
I tried this with Opera, Firefox, IE and Safari (Mac). The best I can get is a blank page with the address cmaxir wrote.

Could you both let me know your site URL, so I can investigate further?

if you prefer your site to remain private, you can contact us via this contact form:
https://en.support.wordpress.com/contact/?jetpack=needs-service

i will send it via contact form

Sent too !