Keeping a blog?

Today I was told that one function of a blog is to keep your friends apprised of what you're doing, especially if you don't live close. I was also strongly encouraged to write frequent updates, especially after our upcoming move. That would be one definition of believing that you have something to say, which seems to me a major reason to keep a blog. That, and being interested in communication with others. Leaving it to updates about your own life, however, is also a rather limited definition, unless you cover all significant aspects, which in my case would include thinking about history and current events. I'll think about it some more.