Facebook bought Instagram, so what Instagram does, reflects on Facebook. And Instagram withholds likes from people, to get them to post more often, and is a known partisan outlet. 
We'll see if this ever gets fixed. It's only been a few years with no indications that FB cares.
YAWYD! You are what you do. We can have the nicest words and intent, but what matters is our actions. So if a person (or company's) words and actions conflict, judge them by the actions. With that in mind, here's some of the things Facebook has done: Instagram : 4 items
2019.08.20 The Well Armed Woman - While Facebook is pretending that their "audit" showed no bias, but a few things they might improve, Instagram (aka Facebook), is banning organizations like The Well Armed Woman: an area dedicated to helping Women with self-defense and gun safety. It seems that Instagram prefers their Women defenseless.
Facebook war on Emoji -
GoWild - Instagram for the firearm friendly outdoorsman, with a few bloggy features. Mobile-only.
Social Media Censorship - The most left-leaning tech companies like Facebook, Twitter, Google, YouTube, Instagram are the ones that are most likely to censor/filter what the public sees... in the name of free speech of course. Which on one hand would be fine (they're private companies), if they hadn't sold people on getting an account and giving up their data, under the fraud that they would be fair, non-partisan and for freedom of information: things that all turned out to be lies.