  Information and communications technologies have enabled the rise of the
phenomenon named sharing economy, which represents activities between people,
coordinated by online platforms, to obtain, provide, or share access to goods
and services. In hosting services of the sharing economy, it is common to have
a personal contact between the host and guest, and this may affect users'
decision to do negative reviews, as negative reviews can damage the offered
services. To evaluate this issue, we collected reviews from two sharing economy
platforms, Airbnb and Couchsurfing, and from one platform that works mostly
with hotels (traditional economy), Booking.com, for some cities in Brazil and
the USA. Trough a sentiment analysis, we found that reviews in the sharing
economy tend to be considerably more positive than those in the traditional
economy. This can represent a problem in those systems, as an experiment with
volunteers performed in this study suggests. In addition, we discuss how to
exploit the results obtained to help improve users' decision making.
