Bulk check popular social media sites for username availability.
Supports Instagram, Steam Community, Twitter, Twitch, Instagram, Minecraft, and GitHub. All available names are output to “available.txt”.
HTTP(S) proxy support for sites that are rate-limited (GitHub & Minecraft).
Over 10 already included word lists for you to use.
Source Code: https://github.com/groans/social-checker
There can be some false-positives, like on Instagram if the account is banned, it will return as available.