Leaving rooms for others to imagine and add things is a good way of spreading out tweets. The verbs thing is related to news and dynamic things.
One finding: the tweets retweeeted the most were on average seven characters shorter (75.8 vs. 82.8) than the ones retweeted the least. This seems logical, with brevity being the soul of wit and all, and also because concise tweets leave more room for retweets and additional comments.
A greater use of verbs — and fewer adverbs, qualifiers and articles – also correlated with a higher rate of retweeting. These also happen to be rules of good headline writing: “Man bites dog” rather than “A man surprisingly bit a dog.”
Dan Zarella suggests that posting to social networks in off-peak hours leads to higher engagement.