We're discussing the use of lose and loose in particular, not other words; and in the specific context of the text in this meme. Just because you can think of plenty of examples of social networks that have loose structures (and so can I, and most people) doesn't mean it's okay to use the word any way you feel is right for you.
Or in other words, a sentence can be structurally sound but be invalid in terms of cultural convention and language use. And in such a case, it's still deemed to be grammatically incorrect - whether it's misspelling or misusing of the word.
But you have the right to disagree all you want.
I disagree:
The phrase 'tight-knit community' exists, and is fairly commonly used.
We were not discussing 'tight-knit'
A 'loose-knit community' would have...
Yes, would have. I've never heard the term, perhaps it exists. But it's used as an adjective here, not a verb as in our case. Point irrelevant.
A social network is often mathematically/academically/professionally described as a bunch of points, clustered, with connections between them.
Even the very word 'network' is etymylogically derived from a net, an interwoven mesh.
You very much can literally loosen or tighten a net, make one that is more pourous or more dense in terms of threads in any given surface area.
Hey there ya go, even Threads is an actual name for a social network.
I think the metaphor or analogy of social networks being described by other terms that literally apply to an actual net or fabric is... actually incredibly common.
All this is irrelevant. Of course you can describe loose networks. Or meshes. Or nets. Note loose is an adjective in all of these cases, again. Not the usage we were originally discussing.
... You've never heard a person being described as having 'loose ties to (other person/group)?
Yeah I've heard. Adjective again.
Have you never watched any kind of detective show, a 'stop the terrorists' political action thriller?
Yes, I have. Irrelevant though.