In fact, nearly every popular software product relies heavily on open source software. Facebook, for example, runs on a language called [PHP](https://secure.php.net/), which is itself open source. Even the web browser you are using right now is most likely open source software or uses it (Chrome, Firefox, even parts of Internet Explorer). And while the "popularity" argument might not win someone over, there are great benefits to be gained in **reliability**, **performance**, and **security** as we mentioned earlier.
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