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1.
Posi-core tweets, invented by Good Charlotte's Benji Madden. He posts these on his twitter (@benjaminmadden) on a daily basis to spread the positivity and motivation.
"Whatever you focus on YOU WILL experience. I know this first hand. So maybe tonight, force yourself to FOCUS on something Great. Don't Be Down. FOCUS. I AM" is an example of a Posi-tweet.
by sheenaDisaster April 13, 2010
 
2.
A complimentary tweet about a person or product. E.g. a "positive tweet."
I couldn't believe it, I actually read a positweet about United Airlines the other day!
by unau October 24, 2010