<p>We compute the reputation of Wikipedia authors according to how long their contributions last in the Wikipedia. Specifically, authors whose contributions are preserved, or built-upon, gain reputation; authors whose contributions are undone lose reputation. </p> <p>We call this a <em>content-driven</em> reputation, since the reputation is computed automatically via text analysis. This contrasts with other reputation systems, such as those in use at <a class="external" href="http://www.ebay.com"><img src="http://trust.cse.ucsc.edu/wiki/modern/img/moin-www.png" alt="[WWW]" height="11" width="11"> Ebay</a>, where buyer and seller reputations are computed on the basis of user-provided ratings.</p>