Sad story but that's just how pumps and dumps work, btw poloniex is owned and operated by cia or is under their influence
Well that sounds like a straight up lie. Feel free to give me anything other than tin-foil hat conspiracy theories.
1-C-cex.com
Maybe.
2-Cryptopia
Poor liquidity and quite new, but I wouldn't say they're completely unsafe.
3-Bittrex
Go here. High liquidity, running for a long time, all the coins you want. Much safer than Poloniex.
4-Yobit
Don't go here. YoBit are running "Invest Box" which looks like a giant Ponzi scheme. They run a terrible dice game. They don't actually have supply for many of the shitcoins that they list and don't process withdrawals for them, and many coins go into "maintenance" for several months at a time (sometimes they're slow even for Bitcoin withdrawals). Not at all safe.