Social Spaces on the Internet

Fall 2018

Reputation and Trustworthiness
Assignment 7


1.  Will Qiu, Palo Parigi, and Bruno Abrahao. More Stars or More Reviews? CHI 2018.
2.  C. Dellarocas. Online Reputation Systems: How to Design One That Does What You Need. Sloan Management Review 51 (3), Spring 2010, 33-38.
3. Tanushree Mitra, Graham Wright & Eric Gilbert. A Parsimonious Language Model of Social Media Credibility Across Multiple Events. CSCW 2017.


Write up

1.  Choose an online reputation system (other then Yelp).  Hypothetically, let's say you choose Amazon.  Discuss motivations for leaving feedback.  What is the cost of doing so?  What does one gain by doing so?  Discuss the costs of leaving deceitful feedback.  Is there a punishment mechanism in the system?  What do we know about the rater of the feedback - their reputation?   Please show examples of ratings and comments from items in the reputation system.

2.  Look at the review for a movie on  For example:
The site has reviews from expert critics and the general audience.  How do the reviews and ratings differ?  Are the reviews aimed at the intended audience?

3. Look online and see if you can find sources of disinformation (as described in Mitra et al.'s related work section). Did the examples you found align with their credibility model? Are there other features you would include in a model to improve credibility detetion accuracy?

Responses should be submitted via compass in PDF form. 

Late responses will not be accepted.

Academic Integrity
For more information, please review the University Student Conduct Code for Academic Integrity.