Twitter Postings: Iterative Design
[If a] Tweet is 133 characters, [you're] leaving only 7 characters for users who want to retweet. This isn’t enough to add the customary 11-character attribution (RT@NNgroup), which is a must if we’re going to benefit from the viral effect of our followers’ followers being made aware of our feed.
I never thought of that. The link is full of other interesting design tips from Jakob Nielsen.
