[UPHPU] Social networking software

[Richard K Miller]

Our company is building a social network, so we're shopping around for  
software. Options include PHPizabi and PHPfox but neither is open  
source. I like the idea of building on Drupal because of the large  
community and open source license. This isn't a religious issue; I  
simply think Drupal has more future and will cost us less over the  
long run. However, it's not really social networking software, though  
some people have done it.

Could anybody recommend software to create a social network? Or  
alternatively is anyone familiar with Drupal development?

Richard