Ultimately, this is a gossipy, lewd, crass online environment in which anything goes and users say anything about anybody. Because some kids under the app's required age of 17 are using Yik Yak (and because there have been instances of users posting threats of violence against schools, which have prompted schools to ban the app or even sometimes to close), access to Yik Yak reportedly has been blocked at some schools so messages can't be posted or received in or near that school. In fact, there's a whole category in the app's online FAQ section related to how the app is blocked on middle school and high school campuses nationwide. That alone should be endorsement enough of this app's serious destructive potential.
Though it may have been created as a way for college kids to locate the nearest local parties, bar deals, and other campus happenings, it's used by some to publicize their latest sexual escapades, complain about people by name, and lambaste teachers for giving too much homework. This app is not for anyone under 17 -- or anyone over 17 who cares about meaningful, respectful social networking. For parents, the most important fact is that much of the content here is not suitable for kids and may be harmful in cases of cyberbullying, explicit sexual content, unintended location sharing, and exposure to explicit information about drugs and alcohol. The addition of photo messaging in 2015 may increase opportunities to share iffy content, though no faces are allowed in pictures and the developers state that pictures will be moderated. Ultimately, this app is not for kids.