Besides, by inspecting the recalls on different patience levels (see Table 3), we find two interesting phenomenon:  Users should have little patience to check more feedbacks (see the column of "Clicks" which gives the number of clicks on different patience levels)  As the patience level increases, the recall of factual feedback rises (see Figure 2) The phenomenon illustrate that users can gradually raise the capability of recognizing the factual feedbacks if they have the patience to check and learn more information.
the truth is that most users only check 1 to 3 feedbacks (see Table 3), thus the probability of reaching factual feedbacks and successfully recognizing them are both low, especially when the factual feedbacks are far from the top.