From the Poloniex site:
On May 2, 2017, the following will be delisted: BBR, BITS, C2, CURE, HZ, IOC, MYR, NOBL, NSR, QBK, QORA, QTL, RBY, SDC, UNITY, VOX, XMG
If you're holding any of these, you may want to check your holdings - and lots of users are dumping these coins as we speak.
QORA, for example, is one that we held - we actually got out 30 minutes after the announcement and were able to make a tiny profit over time. It dropped from 23 Satoshi (.00000023) yesterday, down to 16 Sat today and then, after the announcement, is now hovering around 10.
As always, buyer beware!