Until now, that is. A great article on the Buffer blog (thanks Dushyant Pandit for the heads up) puts all the information in one place and even provides a nice infographic on the subject.
You'll notice that my headline is the 6 words and fewer than the 60 characters as recommended, but this post is far below the 7 minutes 1600 words (1000 with graphic) that's been known to achieve the most interaction. Frankly, if I had to write 1000 to 1600 words, I couldn't post more than once a week because of the time it takes (my Forbes blog posts are usually around 750 words and that can take up to 3 hours to create), so like in everything, there's some tradeoff.
That said, in terms of the general guidelines suggested by the infographic, I've personally found them all to be effective.
If you're just posting personally, none of this applies to you. If you're posting in order to promote your brand, product or music, take note, because the numbers in graphic really work.
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