Think tanks operate in an increasingly blurred landscape between research, advocacy, and politics. While some think tanks focus more on research, others function more like lobbying organizations or NGOs. There is diversity in the producers of social scientific knowledge, including different levels of reliability. Think tanks are not bound by the same peer review standards as academia and can choose propaganda over impartial analysis, like with climate change denial. Social science does not have definitive criteria to separate facts from values, and think tanks have flexibility in whether or not to adhere to scientific standards of integrity. Think tanks can point out wrong claims in politics but also pick their topics more freely than political institutions.