Google protested SOPA and PIPA by slapping a black bar over the "Google" logo on its search page, and accompanying it with a link reading, "Tell Congress: Please dont censor the web!"
Wikipedia opted to respond to SOPA and PIPA with a daylong shutdown. Users still needing to access Wikipedia information can search for a specific term on Google, hover their mouse over the preview and, from there, access the cached version.
Like Wikipedia, Reddit chose to protest SOPA and PIPA by going dark and advocating that users call their congressperson, sign a petition or do both.
Some news Websites joined the protest game. Wired.com, for example, made a show of "censoring" the content on their main page with (removable) black bars.
Even comedy Website The Oatmeal protested SOPA and PIPA in its own special and NSFW, or not safe for work, way.
WordPress offered bloggers a set of "black-out plug-ins" for either blacking out their Website entirely or, instead, applying a symbolic ribbon somewhere on the page.
Mozilla instituted its own "virtual strike" against SOPA and PIPA.
Electronic Frontier Foundation
The Electronic Frontier Foundation also wasted no time assembling a "Take Action" page.
As a Website potentially affected in a deep way by SOPA and PIPA (thanks to its reliance on user-generated content), the ever-popular icanhascheezburger instituted a blackout.
A variety of other Websites, including Minecraft.net, protested against the legislation in their own ways.