Ever notice how the most popular sites on the internet are just amalgams or formulas calculated from the other most populated sites on the internet? Well it’s true, and it’s through that practice we get things like Twitter which is Facebook minus everything but status updates.

Well Twitter’s just one example, as you can see from above, as many sites have their origins the same way. The folks at CollegeHumor compiled a visual list of such occurrences, the top of which you can see above.

Check out the rest of Internet Math here.