Squirrel Money P2P

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I have about $50K to initially invest in the P2P lending space. From reading the threads here many people agree that LC is more secure than Harmoney (all loans have either vehicle or house as security) so I am starting off with LC. I also know about the SquirrelMoney LoanShield and most people seem to say that is "most secure"? I will probably try both LC and SM and avoid Harmoney.

My biggest question is how much out of the $50K would you recommend I invest into each loan? Obviously diversification is better, but I also don't want money sitting there doing nothing while I wait for loans to come in. From what I gather it could take a while for all the $50K to be invested. In the Harmoney thread people are investing from $100 to $400 into each loan but it looks like that would take months to be fully invested on the other 2 platforms.

Also many here seem to say that they ignore the A loans on LC (eg the current loan L00-13-072 at 8.95% which I see has been available for a day or so now (seemingly much more time that other loans) and for that interest rate, would prefer SM) - is that correct? It sounds like Bs are the sweet spot on LC?

Thanks everyone