I'm not actually sure that's true. The only reliable sources on social media (in the sense of 'usually not horribly wrong') are actually traditional media companies like bbc, guardian. Perhaps I'm holding it wrong, but finding other trustworthy sources is actually really hard...
Meta studies often illustrate this well, but one can also do this on an individual level. Seek up reliable sources which opposing core audience compared to ones own demographic and it becomes obvious how horribly wrong they seem with miss leading statements, omissions, weasel words, emotional labeled meanings, mixed with with straight falsehoods.
The only trustworthy sources are multiple sources, and even then we are likely to fail since we are going to be searching for confirmation of what we already believe to be true. Social media do not usually help here, through Wikipedia seems to be a fairly good starting point (especially the talk pages are good to see where different reliable sources disagrees the most).
There's obviously still room for exceptions (especially in small niches, where individual content creators can still make a dent) but this isn't 2006 anymore. The vast majority of the content that covers social, political or economic issues on social media platforms is paid for and pushed by directly interested parties (political parties, companies etc.) with ample funding and is often part of campaigns that span both social media and traditional media. The "indie" outlook is part of the packaging.
The terms of the "paid by" disclaimers are sufficiently generous that they're all but useless once you get past things like goodie bags for influencers or regulated campaign ads.
Yes, it is hard, but there's no such thing as easy trust, and you should always be questioning whether such trust is actually earned or just comforting.
I don't think the "bbc" or "the guardian" are very trustworthy, either (at least by themselves)—both have obvious polemics and blind spots. They also only cover a very narrow, western-centric view of the world, leaving you with piss-poor understanding of world politics. I'm not saying you should ignore them but they're still propaganda.
Substack is invaluable; blogs are invaluable; twitter, as miserable as it is, is invaluable (for direct access to reporters sans newsrooms, if nothing else).
As always, I highly recommend Manufacturing Consent, which well illustrates how to examine financial interests to determine the above. Propaganda does not require conspiracy nor explicit instructions on what messages to convey; it only requires a class of people produced from the same environment, aiming to reproduce that same environment.
