In a tweet heard round Wall Street, Kylie Jenner called Snapchat “sad” last week and sent Snap Inc.’s stock spiraling as investors unloaded their shares in droves, wiping out $1.3 billion in the company’s market value. Actual users, however, met the reality TV star’s indictment with a shrug. According to market intelligence company SimilarWeb, Snapchat engagement didn’t change after Jenner criticized the app. Rather, Snapchat maintained an install rate of 25 percent on all U.S.