Tech companies have got together today, Jan. 18, to protest the Stop Online Piracy Act (SOPA) and its sibling the Protect IP Act (PIPA).

Much has been made of Wikipedia’s promise to “go dark” or shut down the site, for the day as a way of warning what might happen if SOPA became law. The blackout is a way to get the two bills into the mainstream by showing people outside the tech industry how their everyday lives could be affected by the bills. Wikipedia isn’t the only company shutting its digital doors according to SOPAStrike.com. It has a full list of the blackout participants.