This is how free promos work.
I spent zero euro for these promo. 
https://www.instagram.com/thranduilpcsp/
I had to promote this non-profit page before I started to promote my projects. I'm happy, Thranduil fans are happy, everyone is happy here.
Sure, it works for interesting content only.
I heard a veeery funny tale. Hapless admins hired a "marketing manager". She started to post garbage, she almost ruined their project, then she fled. It feels like the admins took her at her word. 
Remember: do not hire unknown "managers", ALWAYS ask for poftfolios.
Take a look at my portfolio and hire me (multiproject mode)
