Just The Right Length
Mark Uzunian at SumAll has created this pretty great infographic, outlining the appropriate length for posts, tweets, headlines, and whatnot, for the highest rate of engagement.
The piece is called The Internet Is a Zoo: The Ideal Length of Everything Online, and he identifies it as a 2 minute read.
Here’s a link to the full size infographic. And here’s a link to a more print-friendly version.