my suggestion

I think we should write about "hobby" on our blog. The reason why I think so is we can talk about what we like very easily, and we wouldn't feel tired or bored even if we write about same topic again and again. Also, if we find the classmates who like to do same things with us, we could get closer friends. Moreover, we can share our knowledge with others, and that would give them a chance to know something new for them. Therefore, hobby is better topic to write on our blog.