How? To decide what goes viral and gets most reach, the algorithm looks at things like your engagement. The more people you who saw your post and liked it, the higher quality it probably is... so, that means it deserves more reach, and it's more deserving to be feautred on the 'Explore' page to go viral. Similarly, if your post got a high reach:save ratio, (where a lot of people save your post), this must mean its a really, really good post and deserves more reach and to go viral. This is why we have created the first save engagement groups.