${?}_{{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}\text{f}\text{u}\text{l}\text{f}\text{i}\text{l}\text{l}animportant\text{r}\text{o}\text{l}\text{e}by\text{c}\text{l}\text{a}\text{s}\text{s}\text{i}\text{f}\text{y}\text{i}\text{n}\text{g}\text{,}\text{e}\text{x}\text{p}\text{l}\text{a}\text{i}\text{n}\text{i}\text{n}\text{g}\text{,}\text{a}\text{n}\text{d}\text{t}\text{h}\text{e}\text{n}\text{b}\text{e}\text{s}\text{t}\text{o}\text{w}\text{i}\text{n}\text{g}\text{i}\text{n}\text{f}\text{o}\text{r}\text{m}\text{a}\text{t}\text{i}\text{o}\text{n}\text{,}\text{m}\text{o}\text{s}\text{t}\text{o}\text{f}\text{t}\text{e}\text{n}to\text{f}\text{a}\text{m}\text{i}\text{l}\text{y}\text{a}\text{n}\text{d}\text{f}\text{r}\text{i}\text{e}\text{n}\text{d}\text{s}\text{b}\text{u}\text{t}\text{o}\text{c}\text{c}\text{a}\text{s}\text{i}\text{o}\text{n}\text{a}\text{l}\text{l}\text{y}to\text{a}\text{b}\text{r}\text{o}\text{a}\text{d}\text{e}\text{r}\text{a}\text{u}\text{d}\text{i}\text{e}\text{n}\text{c}\text{e}\text{.}}$

${?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}$ fulfill $an$ important role $by$ classifying, explaining, and then bestowing information, most often $to$ family and friends but occasionally $to$ a broader audience.

Opinion leaders

Reference groups

Affiliation groups

Gatekeepers

Influencers