Books checked out from a library and terms searched on library computers can reveal a teenager’s questions about sexual orientation, a neighbor’s religious leanings, or a student’s political interests. Libraries across the country, particularly public libraries, make it part of their mission to serve the most vulnerable and underserved user groups, including users who are homeless, unemployed, or recent migrants or refugees.

Source: Librarians, Act Now to Protect Your Users (Before It’s Too Late) | Electronic Frontier Foundation