What Constitutes a Blog Post?

Twice today I’ve retweeted something I felt was worthy of letting my followers know.  Both times the links in the retweet went to someone’s blog post that was pretty much nothing other than a link to the original article or blog post.  Being the devil that I am and because I want the original author to get credit, I retweeted but changed the link so it went to the ORIGINAL article/post.

This got me thinking – what constitutes a blog post?  I mean with sites like Twitter, Facebook, Digg, Diigo, Delicious, and apps like ShareThis is it necessary (or even right) to create a blog post that only links to the original article with little to no content added by you?  Are we really using blogs in the right manner if posts become a version of the aforementioned sites?

Curious, what constitutes a blog post for you?

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