New York CNN —The massive amount of customer withdrawals that led to the collapse of Silicon Valley Bank had all the hallmarks of an old-fashioned bank run, but with a new twist befitting the primary industry the bank served: much of it unfolded online. Customers withdrew $42 billion in a single day last week from Silicon Valley Bank, leaving the bank with $1 billion in negative cash balance, the company said in a regulatory filing. “Now we don’t have that, but we have Twitter.”The experience of the bank run was also far removed from prior eras when a large number of customers would physically show up at a bank to withdraw funds (though some did line up outside Silicon Valley Bank locations, too.) House Financial Services Chair Patrick McHenry (seen here in January) described SVB's collapse as driven by "the first Twitter-fueled bank run." “THAT IS THE PROPER REACTION.”Hours later, the Biden administration stepped in and guaranteed the bank’s customers would have access to all their money starting Monday.