I am going to outsource the development of social network site and I have found the Ukrainian company working on this field - www.web100.com.ua
They have great experience in social networks development using Java, .Net, Ruby, PHP, Elgg, PHPFox. Here is the description of social networks they developed- http://web100.com.ua/eng/expertise/social-networks/index.html
Have you ever outsourced your activities to Ukraine?
And I would be really thankful to hear your feedbacks from those who might have had a chance to work with this company.