As the social media-sparked Bank Transfer Day approaches, the Credit Union National Association (CUNA) reports that over 650,000 people have joined credit unions in the last four weeks. Credit unions have added $4.5 billion in new accounts since the end of September, CUNA says, reporting that four out of every five credit unions affiliated with the group report that the increase is due to attempts by big banks to raise fees on customers or Bank Transfer Day, a movement birthed by social media that will take place tomorrow. Bank Transfer Day organizer Kristen Christian explained the logic behind the movement on the group’s Facebook page