How many letters does the top answer for “director of the social network” have?

The most common answer is eisenberg (9 letters).

Crossword clue: director of the social network

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

eisenberg 9 letters wd-fact-v3

fincher 7 letters wd-fact-v3

any of numerous small songbirds with short stout bills adapted for crushing seeds