You may lend everywhere as long as you will be conspicuous about acquiring collateral which will be more value than your lending out amount. I agree the platform where you will be conducting your lending business should be supportive for dealing against scammers so carefully choosing the sites i more important.

I suggest you to have a blog kind of web pages to list out to your offers on lending and then promote your business through social media. But always deal only with collateral. But my first suggest too, conduct lending business here in this forum.