How they gain insane followers number on fb pages?

Hi everyone,
I'm new here and i wonder and asked many times how some pages in fb get my like and my follow without my knowledge. They made a huge numbers of followers in no time, can anyone explain this?
Thanks,

They either purchase likes and followers or the content is viral worthy.

Isleadlamers said:

... get my like and my follow without my knowledge ...

Click to expand...

Or are you asking about Facebook Like Jacking/Clickjacking?

These are the basic tips for you to get likes on your Facebook page

- update your page regularly
- post interesting status wall
- invite more friends to like your page
- promote your page to other social networking sites
- advertise it to google adwords or Social ad (with pay)
- buy Facebook likes from freelancers on webs like SEOclerks