If ZNGA is not looking good for few more months or the rest of the year, these investors may not be shy of clearing their positions and use money for something else that is kicking. From the past record of such days, it seems we should see lower 5' tomorrow and may even go to high 4 next week. Also, 50 Mil is not a big number but we are seeing price drops of 25-30 cents every day with just 5-10 million volume, so a determined selloff of even half ($25 Mil) might bring it easily to $5. ZNGA' stock trade battle is one of the most exciting games of this year :)