Krewella's Jahan Yousaf, 24, is part of a generation that tweets almost as a reflex. She and her sister Yasmine, 22, have spent the last two years sharing constant updates on the music they make with Kris "Rain Man" Trindl, and along the way have built a dedicated fan base that helped their first album, "Get Wet," debut at No. 8 on the Billboard 200 last September. When something crosses Jahan's mind, you know about it. In February, she tweeted about tour stops in Belgium, her concern about the unrest in Venezuela, and this: "i get drunk to remind myself that i don't need to be drunk."