I assume most of you are using coinmarketcap as your source for prices. I heard that they recently decided to omit South Korean exchanges from their averages due to new laws in South Korea. Creating instantaneous drop per most currencies, since that exchanges had premium prices. They explained the situation later on, but some damage has already been done
I am not going to go into speculations behind this move and even debate whether it should have been done, but it was handled very poorly. They should have let the users know in advance. In short money hasn't disappeared, just your favorite page decided to show statistics in a different way.
South Korea is trying to stop foreigners, read China, using their exchanges, and therefore severely limiting anonymous banking accounts; google for more info.
Oh good, I didn't know that.
However, I noticed a general downfall through Blockfolio tracking as well, especially over last night. As far as I know - Blockfolio is looking at particular exchanges directly, not through Coinmarketcap. So basically I think that money is currently on the way out. I haven't noticed any major news so maybe it's just a normal daily correction - it was going just up up up up and up for days. Or, more likely, the dropping on Coinmarketcap created some FUD that took over last 20 hours....
I consider it an opportunity for us to buy a few coins that we kept an eye on
EDIT: Actually there were some news about closing of Korean exchanges due to the tax investigation.