I was recently asked "What's the difference between micropinions and micro-reviews?" based on my paper "Micropinion Generation: An Unsupervised Approach to Generating Ultra-Concise Summaries of Opinions". The two concepts are actually fairly synonymous.
Micropinion refers to a set of short phrases expressing opinions on a specific topic or entity. Here is an example of a micropinion summary of a restaurant:
So in essence, the terms micro-reviews and micropinions refer the same concept: Very concise opinions about an entity or topic often adhering to some constraints (e.g. character limit or word limit ). Hope this explains!
As you can see, the size of micropinions are small enough that they would easily fit within the display of a hand-held device. Constraints can be imposed to limit the size of the overall generated micropinions.
Micro-reviews on the other hand typically refer to reviews posted on social media websites like Twitter and Four Squares where the goal is to provide a review of a product or some service (e.g. restaurant) within the character limits imposed by these social media websites. Here are a few example of micro-reviews from Twitter:
"A Song of Ice and Fire" series by George R R Martin. It's ok, but doesn't live up to hype
— Micro Book Review (@microbookreview) May 7, 2013
Scribblenauts (DS): As one person said, "The main menu screen is funner than the real game." Hit and Miss controls and too repetitious. 7/10
— Micro Game Reviews (@MicroGameReview) September 30, 2009