seems a rooky error that the government/family/companies haven’t promptly sorted taking down their social media feeds before the story broke.
I'm not sure how that would work. I'm going to guess that when the Iranian police arrest you, it's not like on American TV crime shows, you don't get to make a phone call to your Mum or your lawyer. They will have just disappeared from the grid from one moment to the next (and their friends and family will have been worried sick since then). Quite possibly the first that anybody knew was when someone from the police finally let the UK consulate know, and that might not have been until a couple of days ago.
As well as their personal Facebook pages they have one for their trip here: https://www.facebook.com/PPK2K — the posts stop on 3 January. I suppose we won't know if anyone other than the couple has the keys to the page unless someone starts taking down the unhelpful comments.
Their posts are now being reported on worldwide, which surely can’t be helping diplomacy.
I don't know — it's not as if they were slagging off the country or the regime; quite the reverse by all accounts. In fact it might help with their defence a bit, to show that they are just a bit naive. Their first job is to convince the more paranoid people in the Iranian regime that they are not actually spies, which won't get them freed, but at least it will move them from the "possible candidates for execution" list to the "hostage pool" list.