[drsim]

What's the purpose of getting someone to read your blog post? Rarely is it just that. You'll want them to share/comment/subscribe/sign up for a trial/dive into finding out more about your product/buy. Doing these things will cause them not to bounce.

Fiddling this metric is a fudge.

[onli]

I doubt the rarely. Often it is just that. A blog doesn't have to be a direct marketing tool.

But let's assume that it isn't just about reading the article. Even some your examples could lead to a bounce:

* Sharing is pressing a button and doing stuff on another server, no activity for GA on this blog -> bounce

* Commenting can also lead to a bounce, if using an Ajax-commenter (think disqus)

* Buying and a trial probably won't be on your blog, but on another system -> bounce. Well, maybe, I admit that this isn't necessary.

[drsim]

...so add a GA event to every action that's of value to you: https://developers.google.com/analytics/devguides/collection...