Apple wants everyone to know that their iMovie software makes it easy for you to make a good-looking video. That’s why they ask their users to tell everyone about it when this is fresh on their minds: right after they’ve made a video.
When you upload one of your videos from iMovie to Vimeo, iMovie immediately gives you the option to “Tell a Friend” while the upload is processing. That’s catching their users at the most opportune time, when they’re feeling accomplished and thinking to themselves, “that was easy.”
When are your customers the most pumped about their experience? How can you make it easy for them to tell everyone about it right then?