Be creative and write about something you feel important or something you would like to tell your audience. Write about something you are passionate about.
You must remember your audience. It is not simply me (Mr. Katz) reading this blog!
If you will be ranting about a certain individual, you need to leave their name out of this. You could give them a pseudonym (example: Mr. Ed) or simply leave their name as anonymous.
Make sure your language is appropriate. Do not go on swearing tangents.