Astroturfing manufactures the appearance of independent, spontaneous public support — fake grassroots — for a position that is in fact sponsored and coordinated by a hidden corporate or political interest. The name, coined by U.S. Senator Lloyd Bentsen in 1985, plays on “grassroots” versus AstroTurf: synthetic turf dressed to look like the real thing. It is the flagship of fabricated social proof, because nothing persuades a decision-maker or a bystander like the sense that ordinary people, with no axe to grind, have risen up on their own.
The engine is concealment plus coordination. A sponsor funds a wholesome-sounding “citizens’ group,” hides the money and the motive, and then populates the movement with paid staff, sockpuppet accounts, and bots that supply the posts, comments, signatures, and op-eds. Layered fake engagement (→ T3.13) inflates the footprint, and the coordinated output is later read as consensus (→ T3.19). Common venues include regulatory comment periods, where templated comment floods simulate mass public opinion, and social platforms, where identical talking points surface across ostensibly unrelated accounts.
Because the whole design turns on hiding the sponsor, detection follows the money and the coordination. Ask who funds the group and who profits if it succeeds; genuine advocacy coalitions disclose their backers, membership, and governance, while astroturf resists all three. Watch for the coordination signature — near-identical phrasing, synchronized timing, duplicated or freshly created accounts — that no organic movement produces. And confirm the claimed base exists among disinterested, verifiable people before crediting it: a wave of anonymous comments demonstrates activity, not authentic public opinion. Weight what you can verify over sheer volume, and the manufactured lawn stops looking like a field.