It is the product of the percentage of the target audience reached by an advertisement, times the frequency of their exposure during the schedule. For example, a TV commercial that is aired 4 times reaching 40% of the target audience, would have 160 (GRP = 4 × 40%) i.e., GRPs = frequency × % reach.
What happens after 10k followers on Instagram?
Once you have 10k followers, Instagram will make it easier for you to get people to your website via Stories with the swipe up to link feature. Swipe up is the only way to get a direct link from your Instagram to your other web properties. And, it’s available in STORIES, if you have 10k followers.