As to Ravelry, the "friends' blogs" notification does not seem to be working very well--evidently, there is something a bit off about my feed, whatever that might mean... So, sign up and be my Ravelry-friend by all means! Please! But if you want notifications, it'd be better to rely on e-mail.
The only other way to get notifications is via Twitter: there is a link in the right sidebar for that also --->
Facebook? Well, I did have a page on there but they kept messing with it--removing it, reinstalling it, removing it again. We seem to be at an impasse, Facebook and I, so for right now, it's Twitter or e-mail.
I recognize myself to be a computer idiot (sorry!) but anyhow, I think this e-mail notification is a big step in the right direction.