Why Write a Blog?

I'm going to figure this out as I go.  I plan to write it something like the many journals of the past, to make a digital record of things that "pop" in my life.  Sometimes I am amazed by a memory or idea that just comes to me out of thin air. The only way I can hold on to it, is to grab it so I can see it again.  Looking at that memory, that picture, that experience, or insight, another time may mean something to another reader as well.