Is blogging a waste of time?

I have a horrible feeling that for me, quite often, it's not so much a waste of time as time mis-spent. For a writer, it's the perfect way of procratinating, while still (technically) writing.

I enjoy blogging. I like having somewhere to express feelings or experiences or odd thoughts, and  I like reading other people's opinions/ views/takes on life etc.  Inasmuch as you can never really know someone you've never met, I have nonetheless come to 'know' some really nice, supportive, interesting and entertaining people. But does that make it a good use of time?  (Many people use Facebook for the same purpose, but for some reason, I cannot stand Facebook. It seems not only trivial - often - but too public, for while anyone can read this, not that many people know about it, and it's my own forum.)

So - what do you think? And (perhaps more to the point) is there anything you ought to be doing now, rather than reading this? I'm putting off work on the WIP, which has run into difficulties. What's your reason?

I'd really love to know.