I lie about my age online
Many apps and social networking sites have age limits of 13+ to protect younger users from explicit content. If you are thinking about using a social network, you should talk to your parents about it first.
Lying about your age is not illegal, but it’s not a good idea. The age limits are there for a reason. If you choose to lie and use the service then you should make sure you have properly set up the privacy settings. You should also know how to report something in case you see something you don’t like.