You can see these new Blizzard tweets on the front page of MMO Champ. I personally have scrolled through countless tweets to find lore related questions being answered. I have found maybe 1 or 2 at the very most. Why should PVE and PVP focused players get their questions answered while us Lore fans have to wait until they do a big Lore Forum answering questions thing??? I don't have a twitter or a current blizz wow account but I still love the lore. I ask that someone with an account make a forum on the Blizz forums or if you have a twitter tweat the blizz people. Lore fans should not have to wait while other fans are granted their questions.
I may be wrong, but I think the tweets they post are all from Ghostcrawler and as he is the Lead Systems Developer, he really does not have much to do with the game lore. As to why they only post his and not Kosak's, I do not know.