(CNN) -- Two words, delivered with index finger punctuating the air and directed at the president of the United States, made a little-known South Carolina congressman one of the most controversial men on the Internet -- at least Wednesday heading into Thursday. Many Facebook and Twitter users condemned Rep. Joe Wilson for his outburst toward President Obama. As soon as Rep. Joe Wilson was identified as the person whose angry and audible outburst disrupted President Obama's health care speech to Congress, condemnation was swift -- and brutal. Within minutes, someone had altered Wilson's entry on the online encyclopedia Wikipedia: "He is a [expletive] that called the president of the United States a liar on national television and has no respect for the office he holds."
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Little-known South Carolina congressman shouts, "You lie!" at President Obama
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Wikipedia disables editing for Rep. Joe Wilson's entry, citing "vandalism"
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Name-calling rampant on Facebook and Twitter as political passions run high
On Facebook, where users aren't impeded by @placeholder's 140-character limitation, a prolonged and nasty war of words dominated Wilson's page.