What is my IQ?

I took an IQ test few years back, my IQ was measured around 145 at that time. Then, after four years, came an application on Facebook, which measured my IQ at 124. My brain cells must have took a severe beating because I distinctly remember that the first IQ test was a lot tougher than this frivolous widget on Facebook. Since then, I have been asking people whether they know of any particular site, paid or unpaid, which can accurately tell me my IQ. There is one High IQ Society on the internet, which allows you to take very accurate tests to measure your IQ, but the catch is that you need to be a member of that society. I will be crossing the fine line between foolishness and lunacy if I start hoping to join that society. I am content to be on the side of foolishness; at least I can roam about freely without posing any danger to the society.
Coming back to the IQ thingy, yesterday, my friend confirmed that all the IQ tests are wrong, at least in my case. It came after my chance remark that I regularly read Dilbert blog and I just love XKCD comics; he said that it is a proof enough that my IQ is way below 60 and refused to quantify the exact measurement. Case is closed.
PS: Should I tell him that I am trying to solve problems on Project Euler? Maximum that can happen is that he will rate my IQ below zero…