Kik
Kik is a free messaging app that allows users to exchange photos, videos, and gifs. It also features extras such as special emojis, e-cards and mini-games.

Why you should be concerned:
Kik is heavy with advertising and it’s never clear whether you’ve been messaged by an ad-bot or a real person.
Kik’s age rating is 17+, yet anyone can download it since there’s no age verification. App Store and Google Play reviews reveal another concern for parents: many users utilize Kik to sext with strangers.
Another concern is privacy. As users connect with others on Kik using just a username, there’s no way to validate users.
Kik doesn’t offer parental controls, making it easier for minors to chat with strangers without parents’ knowledge. There are, however, parenting apps like KidBridge or Qustodio let you review social network activity.