I know people who are obsessed with maintaining streaks on Snapchat, but I see the effects of a streak as different from the effects of the likes and shares mentioned above. While both mechanisms encourage users to use their platform more, keeping a Snapchat streak with friends puts an emphasis on actually communicating with individual people instead of blasting content across the platform.
Whether or not that communication between individuals is high-quality will vary from person to person, though.
Whether or not that communication between individuals is high-quality will vary from person to person, though.