Who am I?(Riddle)

who am I?

I am fat,I swim fast ,I live in the ocean

My First Post

I like a blog because it is like a diary or a journal.A blog also could put pictures or things that express yourself.You could also communicate with others at blog.We could also write comments at blog.You could have a electronic pets at blog.You could also write comments that

express yourself.You could play games or applications at blog.We could write a story about things that you did or feel at blog.You could also write the things that you did on your holiday.You could also put video.