Since adding the “My Story” feature a few months ago, Snapchat has evolved from a great platform for sharing silly selfies with friends to a bona fide social media super giant. And now, many celebs (including Snapchat’s newest member, Rihanna) are getting snap happy as well — most notably Kylie Jenner (username: kylizzlemynizzl), mainly because she’s giving us the most unfiltered look at her family’s …