I am looking for information on exactly what sites with the ability to upload content like video, user profiles, and indexing capabilities are built with… PHP or what?

Basically, I want to build a site that allows users to have a profile and upload a video on their profile, and I want to index content on my site for users to use keywords to search for profiles. I’m not worried about the technical knowledge, I just need to know what these sites are built with.

Also, I want the profiles to have the ability to message other profiles. Not to steal an idea, but I will use myspace as a perfect example. Take this like myspace with a few modifications and an indexing function geared toward a specific target audience. Any help would be appreciated.

You can build a social networking type site in Joomla (php based, I do believe):

http://www.joomla.org/about-joomla/getting-started.html
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