persons

If your name was I, and you wrote a blog about something you'd done that day, you would be writing in first person and third person: "I wrote a blog about what I did today."

If your name was You, and you wrote a blog about something you'd done that day, you would be writing in second person and third person: "You wrote a blog about what you did today."

If your name was We, and you wrote a blog about something you'd done that day, you would be writing in first person and third person: "We wrote a blog about what we did today."

All you want to know about person and form and case: go.

You can't blog, dog.