I dont know one person my age (22) who does not use snapchat on a daily basis
Legit companies have begun spending more with snapchat ads
Snapchat is seen as less saturated for businesses looking to advertise than competitors like facebook
some new game came out that apparently awesome.
For you guisers that say Instagram has stories too.. they both have their place. Its hard to describe. People post super random shit on snapchat. Conversely, people post more "professional" stories on instagram. Peoples moms and grandmas have instagram. "sarah," a college student, doesnt want her mom to see her spending the money that was meant for "x" on blacking out at the bars.
Snapchat will go up. just buy it.