We need to change the owner of leads created from Social using the Social - CRM integration, how can we do it?

We need to change the owner of leads created from Social using the Social - CRM integration, how can we do it?

All leads created from Social go to CRM with the Admin account as Owner. We need the user on using Social to be the owner. We tried the Assignment rules and it only work for webform leads. How can we tell Social to let the user triggering the lead creation as the Owner in CRM?