I'd like to provide c.o.d. as a payment method in Social Deals.
Yes, we will add the ability to include a line break within the next updates.
We released version 1.0.4 on November 26, 2013 and this version does contain the option to rename the cheque payments to whatever you like
and you also have the ability to mark these payments as completed.
This should makes everything easier and you can use it as cash on delivery also.
When you updated the plugin to version 1.0.4, then you should see the option to rename it within Deals > Settings > Payment Gateways tab > Cheque Payment Settings.
There you can change the title for this payment.