Write on any topic you like. There is not fixed rule. People say that you should introduce yourself and and your blog in your very first post, but I do not think so. You create an About Me page and introduce yourself but as for writing the first post, write anything. But do remember to blog about a fixed topic, if today you blog about movies and tomorrow you blog about sports, that will not do. Keep your niche fixed. See the related link for an example.
The very first thing you need to do when creating a blog is to decide on which topics you want to write about. It is always good if you have a particular interest in the topics you write about as it will make writing easier and more enjoyable.
I think academic blog is a blog that focuses on academic topics.
Blog names are usually based on the the topics inside the blogs.
In the blog Freespace, all sorts of topics are discussed like sports, technology, business, universe, local news, international news. Freespace is a blog by Timothy Sandefur.
Blog = Web Log (journal entries, expressions through web logging on topics). Myspace Blog = writing your expressions or thoughts on topics on myspace. MySpace gives users the opportunity to blog through their platform. Essentially, your MYSpace blog is a blog located within your MySpace profile.
The creator of the first blog was James Monro, he was a traveler from Cambridge, sadly he died when his trailer crashed in to a car but luckily his blog was already posted on the internet.
There are many types of topics discussed on the Citizen Video blog, including but not limited to: Business, environnement, politics, sports, world and more!
The Netflix blog contains thoughts and comments by writers on Netflix. The topics may vary from blog to blog, depending on the writer. Sometimes the blog will contain new information about Netflix.
Pharyngula - blog - was created in 2002.
Balkinization - blog - was created in 2003.
Fail Blog was created in 2008.
The Rag Blog was created in 2006.