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Re:Is your startup idea already taken? by mmahemoff on Tuesday February 21, 2012 @10:45PM (#3619345)
StackOverflow vs the legacy of Expertsexchange is a great example of this.

Those guys understood the user well and built a great user experience around what had previously been lacklustre at best.

Re:Is your startup idea already taken? by esrauch on Wednesday February 22, 2012 @12:29AM (#3619600)
Even though I should know better by now, I still read it as "Expert sex change"