What are the point of writing a blog ??

Actually till now, i have no idea what's a blog for,
For me, blog is just a place for express mood, write when they r moody or they r happy with their life.
And blog also can known as a communication tools, cause it might able to build relationship with others peps ha....

but the purpose to me for writing a blog is EXPRESS my GOD DAMN mood, but not at all on the blog cause blog is a page that able to let everyone have a look at it, so some private things i will not write it at blog ahahah.......

Actually i like to look at peps blog because......
hmm.... hmm...