opinion leader oˈpinion ˌleader \cross-ref from 'leader' needed - this didn't quite seem to fit there noun [countable]
MARKETING someone whose opinion is respected and who influences what people in a group or society buy:
• Opinion leaders may be important in increasing the level of recognition and acceptance of a new product.
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opinion leader UK US noun [C] (also opinion former)
► MARKETING a person whose opinions about something such as a product or issue have a big influence on the opinions of others: »
Computer repair technicians are often opinion leaders.
Financial and business terms. 2012.