How do I create bulk community users and upload via CSV to my website?

[blazedo]

Hello guys!

I have heard about how some forum or social network developers are using bots or real something to create as many users as they want to their community website.
Dunno if it's true or false however, I wonder how I could build up same community via uploading CSV file.
My website is still coming up, so I want to know if anyone here has any idea of our this works.

Thanks!