This is much better than expected and instead of Microsoft Lumia all the Nokia regional Twitter accounts have changed their names to “Lumia+region”. Microsoft Lumia is still present there but “Lumia” has got the focus here.
The same re-branding will happen to Nokia regional Facebook accounts and Windows phone Facebook account too.
Both main Nokia Facebook and Twitter accounts will return to Nokia. Also, going forward both @Windows and @Windows Phone users are going to be supported by the @Windows accounts on Facebook and Twitter.