We're all ignorant of the vast majority of facts relevant to almost anything. Comprehension is expensive and scarce. That being the case, simple extensions of good faith count for a lot.
Ignorance is fine -- it is an unfortunate fact that nobody can learn it all. But to think that one is "engaging" in science -- I suppose most fans of the Page think they're somehow engaging in it (anecdotal) -- is, well, wrong.
As much as I'd like it to be true, looking at a bunch of .gifs about quantum mechanics and astrophysics plastered with white majuscules does little for one's understanding of science. In other words, IFLS is to the scientific community as r/atheism is to the religious-sceptics community (not the best analogy...).
The problem here is willful ignorance, what a person does when confronted by fact. There's probably a lot of antivaxers new-age woo believers and homeopaths who enjoy the fashionable "quantum" quips but have zero interest in doing anything but republishing the images. They ape the language, but don't understand the mindset.
These aren't simple extensions of good faith though - that would be more like wearing a pin "I believe in science!", which is a-ok.
The problem arises when people share untrue information out of the notion that they're spreading science. Comprehension is indeed expensive and scarce, which means recognizing the borders of your own knowledge and the start of your own ignorance is extremely important. Pseudoscientific drivel has no place anywhere.
It reminds me of the criticisms of Mythbusters. They do bad science a lot of the time, with shoddy understandings of underlying mechanisms. It's fair to criticise them as bad science for this. But on the other hand, they very much promote the idea of "think of something, suggest what might happen if you do it, then do it and see what you find (, and then publish it)". So while they may not do good science themselves, they do promote the fundamental ideals of science, and are open to having their suggestions found wrong.
Whereas the facebook page does nothing like this at all - it's just funny pictures with a theme. It doesn't encourage any way of thinking or promote figuring out the world.
As much as I'd like it to be true, looking at a bunch of .gifs about quantum mechanics and astrophysics plastered with white majuscules does little for one's understanding of science. In other words, IFLS is to the scientific community as r/atheism is to the religious-sceptics community (not the best analogy...).