There was an informative report from IOSCO on crowd funding and peer to peer lending earlier this month. The report highlights the developing nature of these type of platforms and considerable risks associated with such platforms such as default risk, platform closure/failure, fraud, illiquidity, cyber, information asymmetry, and investor inexperience. The report also outlines the different business models (of particular interest are those tested models growing in the US, China & the UK) in the approx $6 billion market and how regulation is trying to address these new models (or not in some cases).
The report lists the major players in the P2P lending market as per the exhibit below.
Interesting stuff.