This plugin works only on newsfeed posting. It means, after you wrote a new article, a new posting will be displayed on newsfeed, and this plugin will work with it.
So if someone leaves a comment on a blog post, and writes that comment from the blog post page, but not the newsfeed, notifications will not be sent? Only if they write their comment on the newsfeed?
Just want to clarify again:
This plugin works on newsfeed and the plugins' detail page also (eg if someone leaves a comment on a blog post, and writes that comment from the blog post page).