Who: Samantha Sohl, USC junior majoring in business . . . What: Preptista, a blog covering all things fashion, beauty and lifestyle, which has over 8,000 Instagram followers. . . . How she started: “I was out to dinner with my mom and my mom’s friend and I was telling her about this lip gloss I had received for Christmas. And I was going on and on about how it was the best lip gloss I had ever tried and all these amazing things about it. And my mom’s friend was like, ‘You should write a blog.’” . . . Favorite part of blogging: “Making friends through it has been such a rewarding experience… These are friends that I never would have met or seen in my entire life if I hadn’t had my blog.” . . . Inspiration: “It comes from everywhere. It comes from things I’m doing in LA, things I’ve bought, the season, what my friends are saying, things I’m reading on other people’s blogs.” . . . Brand collaborations: Glossier brand rep and other collaborations on a post-by-post basis. . . . Common...