I'm not sure how it works. I think you have to pay on heepsy.com, let's say. All they do is give you contact information, then you pitch the influencers. I'd like to offer them nothing to read the first entry. If they like, I'd pay them 5-20 to read the entries and sell it to their followers. My blog is the diary I wrote in prison. I wrote it as if I had a blog.
I think the facebook stuff is working for me and social media influence isn't worth my time or money. My audience varies wildly on country as far as male to female interest, but age is pretty steady 25-45 are clicking my link. If in the US 82% (what a staggering number) of them are women. In Europe it's 55% men. Australia, New Zealand, Canada, near 50/50
If I could find a good gardener influencer who likes to read a bit after a long day.
Heepsy.com provides you some key metrics that allows you to detect fake followers. For example, there is a graph with the historical growth of followers of each influencer, so if someone has an abrupt increase in followers, it can be an indicator of follower purchase. It would be enough to go to his post on that date and check if he made a contest or similar. If he did not, it is very likely that it is a purchase of followers.
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Also has an engagement rate for each influencer, a very high engagement rate use to be an indicator of purchase of likes and comments.