What’s it all about?

I’ve been running a club website for years.  I have helped several people set up their own websites.  And I have set up experimental websites for myself.  My ten year old son has his own website.  But I have never had my own blog before.  What’s it for?  What should I write on it?  Will anyone even look at it?  If you’re reading this, please tell me – what’s it all about?