Exactly one year ago, something quite terrible happened.
Poloniex stole some 1800 BTC from its customers. That's old news, but as I've lost more than one
BTC int the affair, I'm not ready to forget.
Poloniex hasn't paid back, yet.
They've added a new splash screen recently, explaining lending is high risk.
This is 100% BS.
Several exchanges propose lending services, to allow their users to do margin trading.
It is safe, providing the exchange doesn't allow huge trades on smallish sh*tcoins, that very few people are trading. That is gross negligence.
Poloniex got burned, so did I, as all the other people who had part of their funds stolen.
As Poloniex hasn't paid back yet, I can only recommend newbies and all other bitcointalk users NOT TO USE Poloniex when they need an exchange.