Shadow banking in general has come back to life after being hammered during the financial crisis, however one segment has been especially active.

Peer-to-peer (P2P) lending, in which loans are made privately through individuals who most often connect through a network of relatively new websites, has exploded over the past five years. It is now the fastest-growing sector of non-bank lending, according to an exhaustive Goldman Sachs report on the shadow banking industry.

The P2P industry had just $26 million in loan issuance back in 2010, as the worst of the banking crisis passed; but that figure now stands at a robust $1.7 billion. While that’s still a fraction of the total $12 trillion in loans across the U.S., and even pales in comparison to the $4 trillion in total shadow bank loans, it represents a growth of 65 times during the period.