I've been looking at ways to invest my Bitcoin, and I've come across several lending sites that look legitimate and promise to bring me a fair, legitimate return. (Loanbase and btcjam)
Your money invested on peoples loan are no guaranteed by the site itself. Its just a platform. Getting a repayment still depeds on the borrower. If you want a safe platform to offer a loanthen best is to just start your thread here. I will suggest you to always ask for a collateral. If not, you can also try btcpop. They hae an option for a collateral loan so it's the safest way to invest in someones listings.