| They are a comparison number based on 'normal'. A 100 on that chart means that the same percentile of 'x' goes to the website as the internet average. For example: in this case, TT.Net gets 50% more males than the average website, and less than half of females as a ratio. Gender is a bad example of this, specifically because it is a 'one or the other' type thing. However, if you examine ethnicity, you see that 4x as many hispanics visit TT.Net than the 'norm'. The list of 'similar audience' makes me think that they have a valid source of data. Things like the dallas craigslist coming up is a good indicator. How do they get this data?
Alexa gets its data via the "Alexa Toolbar", a piece of spyware installed in your web browser. I have a feeling that this site must do something similar, or buys its info from another piece of spyware. This is extremely similar to "Nielsen" ratings that TV has, which is a box that is installed on your TV to remember what you watched, when, and how many people were there. The difference is Nielsen homes are volunteers. They can determine using the spyware, what 'kind' of person you are. This of course is confused by multiple people using the same account on the same computer however.
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