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Comparing a book, a blog, a tweet
An effective book adds to world's collection of human knowledge and lives on to teach and encourage future generations.
An effective blog post gives a useful tip or trick.
An effective Twitter post makes you think, "I can't wait to see what crazy thing he'll say next."
I'm not sure if an effective book always needs to "live on" into the future (some books are poignant for a specific time).
However, you ideas for effective blog post and Twitter post are bang on.
Another POV on all three – in each case, effectiveness may be measured by the quantity, quality or nature of responses.
A retweet accompanied by an opinion, a thought-provoking or inspired comment on a blog. In the case of a book, it's whatever the reader takes away and incorporates into their output.
Your post prompted this response, you can be the judge :)
Whoa, that's getting really meta! :)