How to get followers on Facebook?

[Josh]

So I have 1,000+ friends and I've decided to go through and delete some and stop adding people I don't know. I know about the Facebook follower feature, and I went into account settings and checked the box to enable followers. Now how do I get followers? For instance, does someone follow me when I decline their friend request, or do they have to specifically click "follow" instead of "add friend"?
I would normally assume it was the latter, but for some reason I've found that I was following people (unknowingly) with whom I was formerly friends on facebook because they deleted me or just denied my friend request in general.