Kardashians Kim and Khloe and Jenners Kendall and Kylie are keeping up with the ways to monetize themselves. On Monday, they revealed their apps, costing $2.99 a month. New websites (with paywalls) debuted as well. Kardashian and Jenner Sisters Introduce Apps and Websites With Paywalls — Native Ads to Come http://t.co/9zpIm1PZvc #advertising — Social Data […]