Why write a Blog?

I looked this up first and though the subject of blogs has been discussed, my question is What motivates you to write one?

For the life of me, I can’t understand them. If you want to keep a diary, then by definition it should be private and read by (almost) no-one.

If you want to publish your missings – why not use facebook and add photos and videos and stuff (I hate facebook too, btw).

I tried writing a blog, but found that I couldn’t wrap myself around the concept or idea of it. I also do not read anyone else’s, though I read a lot online.

Would you like to explain why you write one and perhaps convince me otherwise?