▁priv acy ▁to ▁the ▁company ' s ▁business ▁model ▁and ▁the ▁company ' s ▁m ish and ling ▁of ▁data . ▁This ▁was ▁Mr . ▁Z ucker berg ' s ▁first ▁appearance ▁before ▁Congress , ▁prompt ed ▁by ▁the ▁revel ation ▁that ▁Cambridge ▁Anal yt ica , ▁a ▁political ▁consult ing ▁firm ▁linked ▁to ▁the ▁Trump ▁campaign , ▁har v ested ▁the ▁data ▁of ▁an ▁estimated ▁ 8 7   mill ion ▁Facebook ▁users ▁to ▁psych olog ically ▁profile ▁vot ers ▁during ▁the ▁ 2 0 1 6 ▁election . ▁Z ucker burg ▁was ▁pressed ▁to ▁account ▁for ▁how ▁third - party ▁partners ▁could ▁take ▁data ▁without ▁users ’ ▁knowledge . ▁Law m akers ▁gr illed ▁the ▁ 3 3 - year - old ▁executive ▁on ▁the ▁pro l ifer ation ▁of ▁so - called ▁fake ▁news ▁on ▁Facebook , ▁Russian ▁inter ference ▁during ▁the ▁ 2 0 1 6 ▁president ial ▁election ▁and ▁c ensor ship ▁of ▁conserv ative ▁media . ▁ ▁Crit ique ▁of ▁activ ism ▁For ▁Mal col m ▁Glad well , ▁the ▁role ▁of ▁social ▁media , ▁such ▁as ▁Twitter ▁and ▁Facebook , ▁in ▁revolution s ▁and ▁protest s ▁is ▁over st ated . ▁On ▁one ▁hand , ▁social ▁media ▁make ▁it ▁easier ▁for ▁individuals , ▁and ▁in ▁this ▁case ▁activ ists , ▁to ▁express ▁themselves . ▁On ▁the ▁other ▁hand , ▁it ▁is ▁harder ▁for ▁that ▁expression ▁to ▁have ▁an ▁impact . ▁Glad well ▁distingu ishes ▁between ▁social ▁media ▁activ ism ▁and ▁high ▁risk ▁activ ism , ▁which