If you go to Iran, there are some social medias are blocked by goverment such as facebook, youtube and so on.
The easier thing you can do is download PVN aplication and install it. You have to set wich country do you wanna use, as if you are there. I used to set germany or USA.
Whenever you wanna open social media, make sure the application is working. If not, you can open PVN first and connect it.
After that some social media or aplications are opened for you.