UPDATE: In Instagram, you can choose to post to a page instead of your profile. You just need to go to your profile and tap the three horizontals dots in the top right. Scroll down and tap ‘Linked Accounts’, then select ‘Facebook’.
Every now and then you receive a mystery email from a friend. It includes just a link, and you notice it has been sent to everyone in that person’s address book. Or you might receive a direct message on Twitter