A user has an ID which is unique, a name, a nickname, an email address, a date of birth, an age, and a phone number. An age can be obtained in combination with the date of birth and the system date. A hometown where users were born has a city name and a state name. Multiple users can be associated with a hometown. There are two types of users: registered users and unregistered users. The SSN of a registered user is stored, but an unregistered user does not have it. A registered user creates a post. Each post belongs to one user and must have exactly one ID, title, and content, along with a date. Multiple posts can be associated with a registered user. A registered user leaves a comment about a post with the text and the date of the comment. A comment is associated with one post and one user. Each post can have multiple comments, and each user can comment on multiple posts. An unregistered user cannot create a post or leave a comment but can only read them (a registered user can also read). Both kind of users (registered and unregistered) can like a post. An ID for liking a post is stored when a user likes a post. Only new answers.