Minister admits Iran cannot block Facebook forever

But tech-savvy Iranians have resorted to measures, known as anti-filters, to circumvent the restrictions.

Technical glitch gives Iranians access to Facebook, Twitter, official says

On Monday evening, several Iranians said they gained access to their accounts without having to get round a government firewall, leading them to hope that authorities had relaxed a ban in place since anti-government protests in 2009, some of which were organised on social media.