Our online lives depend on little things. Slow performance and lack of functionality caused by limited computing power restrict our data gathering ability in seemingly small but consequential ways. (As always, our perceived needs run before computers’ ability.)
As an example, Google will not search for the symbol @ as a part of an email address. At this time it would be too expensive.
Google does, however, notice the periods, and we can take advantage of that.
While figuring out how to massively source emails, I noticed that many companies predominantly follow the firstname.lastname@example.org format. And some,