In my experience, big data tends to be missing three types of information useful for social research: demographic information about participants, behavior on other platforms, and data to operationalize theoretical constructs.
Ekuhlangenwe nakho kwami, idatha enkulu ibonakala ilahlekile izinhlobo ezintathu zolwazi eziwusizo ucwaningo lwezenhlalakahle: ulwazi lomphakathi mayelana nabahlanganyeli, ukuziphatha kwamanye amapulatifomu, kanye nedatha ukuze kusebenze ukwakheka kwemibhalo.