Let's say your gmail address is email@example.com - If someone sends an email to any of the following:
...it will still reach YOUR inbox. Gmail strips out the dots (periods) from all gmail email addresses when they are received by the gmail servers, but almost every signup offer will consider the above variations as a separate and unique gmail address. Try it yourself and see. It really works! So if you want to sign up a number of times to get more than 1 bonus opportunity just move the dot (period) in your email as many times as you want.
I recently used this hack to sign up with jetsetter[dot]com who were offering a $25 credit for referring other people. I registered using my main email address and then referred the same email address ten times using the above hack i.e. I referred myself ten times. The people (me x 10) still needed to buy something before I received my referral bonus but that opportunity presented itself soon after, whereby I was able to take advantage of another great deal ten times. It was like double dip hacker heaven. More to follow on that shortly. Have you been able to take advantage of this or a similar deal? - Let me know in the comments.
Check out the rest of my travel hacking tips here.