- bad idea for companies to enforce what people should do in their private lives ... invasion of privacy

- unethical to use other people's accounts, puts current employees in a bad position having to report on their classmates' Facebook accounts to their employer

- misleading information -- companies don't want to ask questions about what they see on Facebook, so picturess or wall posts posted by other people won't be placed in context

- bias. interviews have "illegal questions" like religion, even during small talk, etc.