If you looked at Vines original terms of service, the age rating is the same as Twitter (13+) and even though Apple`s App Store rated the app a 17+, the Google Play Store gave it “Parental Guidance” rating in the United Kingdom, it reads “Apps do not always have pre-defined content that can be classified beforehand. Certain apps function as portals (e.g. to stream content), offering a broad, variable range of content from which consumers can choose.” This is the same rating that’s given to essentially all social media apps on the Play Store except dating apps like Tinder, that app is a 18 on the Google Play Store. In a nutshell, it means user generated content created by the USER and NOT the app maker. In the same quote it reads: “For these apps, we use the parental guidance icon, alerting parents that the app may provide access to content that is not appropriate for their child.”. If you are asking for my opinion, I think it should be 13+ and that the app should be made so it gets a 12+ instead of a 17+.