socialscan is an accurate command-line tool to check For email and social media username usage on online platforms, given an email address or username, socialscan returns whether it is available, taken or invalid on online platforms. Other similar tools check username availability by requesting the profile page of the username in question and based on information like the HTTP status code or error text on the requested page, determine whether a username is already taken. This is a naive approach that fails in the following cases: Reserved keywords: Most platforms have a set of keywords that they don't allow to