We have 2 completely different brands on our one account. The main brand has about 5 different social channels and a few of these have slight differences in the URL. The new brand only has 3 channels as of right now. It would be a lot to have to type or even copy/paste that for each campaign we send out.
I think it would be better to allow multiple social configurations -- maybe separate it by database and/or allow the user to choose which social configurations to use for that particular campaign.