Method to get real likes

Hello, guys. This is my first post in this forum. Well... I saw loads of brazilian pages that increased to more than 1 million likes in few days and the majority of them is real people. Some of them were invited to like the page and there are other people that invited their friends without knowing it (one person that invited me told me it's like a virus). Is there any auto-accepter when you invite someone to like a page or a way to make your friends to invite their friends to like a page (like a chain)? Thanks!

Its not a Virus its a trick
Give Attention and you will understand the Magic

I searched around the whole internet and I didn't find nothing. Give me a little tip

Is it page cloning?

Clickjacker maybe?

I don't think so. For example, I asked a friend that invited me to like a certain page why he did that (I found it strange because he didn't have a like in that page). He told me that it was a virus...