“…For instance, in References [4,112,124], the authors investigate the value of a collaborative activity in social networks or question-answering platforms to achieve a search task. One interesting challenge in this eld is to build the collaborative group according to users' compatibility, availability, and expertise [14,85,94,121]. Regardless of the task goal, another emerging line of work focuses on collaborative task optimization in crowd-sourcing platforms [1,71,93].…”