text comments – Comments about a single item are collected and presented to the
users as a means of facilitating the decision-making process, such as in [72]. For
instance, customer’s feedback at Amazon.com or eBay.com might help users in
deciding whether an item has been appreciated by the community. Textual comments are helpful, but they can overload the active user because she must read
and interpret each comment to decide if it is positive or negative, and to what degree. The literature proposes advanced techniques from the affective computing
research area [71] to make content-based recommenders able to automatically
perform this kind of analysis.