There is no definite answer when it comes to whether or not teenagers can have a blog. There are a few factors that need to be considered before making a determination, such as the age of the teenage blogger, the subject matter of their blog, and whether or not their blog is considered professional.
Generally speaking, if a teenager is under the legal age to consent to sexual activity in their state, then they cannot have a blog that discusses sexual topics. If the blog is about anything other than school or homework, then it is probably safe for a teenager to have one.
However, there are still some things to consider, such as whether or not the blog is moderated and if it has URLs that could lead people to other websites with explicit content.
When it comes to conclusions, it really depends on the individual teen and their blog. Some teens may enjoy creating a personal space where they can share their thoughts and feelings with the world, while others may view their blog as an opportunity to make money.
Ultimately, it is up to each teen to decide for themselves if blogging is something that interests them and if it would be safe for them to do so.