Social media is also a good platform to get good news from but the question is, are they reliable? Why so many members emphasize on doing your own research is because of the so many cases that many people face at social media due to the high level of rumor and scams that are there, hype and FOMO from the social media have made many people lose most of their money to scammers. That is one of the reasons why it is advise to do your deep research, so the you don’t get scammed off your hard earned money.
When we say that you should DYOR, this includes checking what is said on social media platforms, given that not everything that is published on them is 100% wrong, just as it is not 100% true. A wise person is one who knows how to conduct research that provides him with the most reliable information possible, and thus gives sufficient time to research the sources of information that he finds.
In the field of crypto in general, I have a lot of confidence in the bitcointalk forum because in the most extreme cases, if I do not find satisfactory search results, I can create a topic in which I ask about what I want, and there are good members who will provide appropriate advice without hesitation.