How would that work? Two companies merge or one aquires the other but what happens to their Twitter accounts?
As far as I can see, there is no way of merging accounts and I think there is a real need to be able to do it.
Think of the company merger / aquisituon example. Both companies invest in their social marketing strategy and have healthy numbers of loyal brand advocating followers. They merge and then what?
They could either keep one and rename it but lose the followers from the other or start again with a new account and loose both sets.
Of course they could run a campaign to their followers to try and get them to the new account but it would be so much easier if Twitter offered account merging functionality.
Or maybe there needs to be an app for that…