Originally Posted by
Athena53
Haven't heard from e-Rewards yet, but I just got kicked out of a survey on Hilton.com because I'd already taken it using another ID (or similar words to that effect)- I guess they have a way of making sure you don't take a survey through Hilton.com AND e-Rewards.
Probably either identification of your IP or (less likely) a persistent cookie that both sites can read. If you have access to another computer (e.g., work or tablet) you might want to segregate and access one site exclusively from one device and the other site exclusively from the other.