I bet the videos about NPD contributed a lot. "Narcissists have dilated pupils/different eyes", "a narcissist never knows they are a narcissist", "NPD and ASPD are almost the same", etc. Pop psychology is the default information for narcissism.
Also, the ASD and ADHD videos. Starting with the RSD myth in ADHD (it has not been scientifically proven, and the reaction can be explained by the not officially recognized yet more evidence-based emotional dysregulation in ADHD), followed by the stereotypes, the anecdotes turned into symptoms, etc. I've found some inaccurate videos about dyslexia, tics, etc. The popularity of neurodevelopmental disorders has been bittersweet.
Oh! I've seen some BD misinformation, especially comparing type 1 and type 2 bipolar disorder. This is also pervasive on Reddit. For example, that type 2 depression is worse. No, type 2 may have longer and more frequent depressive episodes, but the severity is the same (it isn't "worse" or "more severe" or "deeper", they just spend more time in it in average). Another one is that type 1 do not experience hypomanias or not as often, when they are the ones experiencing more hypomanic time in average (because type 2 spends that extra time depressed, while type 1 has more balanced times in average). Also, not remembering that these are statistics, not rules. Many people with BD-I tend to a depressive polarity (some studies have found this is the case for many bipolar patients as age progresses) and many people with BD-II will spend less time depressed than others with BD-II.
Some unipolar depression videos are okay, but eventually you reach the "just go for a walk", "medication is a scam", and other antipsychiatry and pseudoscientific nonsense. There are too many of those and the algorithm will mix them up sometimes. Also, a lot of misinformation about the different depressive disorders, and about these different depressive disorders versus the specifiers of depressive episodes (two very different things).
Claims about OCD being an anxiety disorder when the DSM-5 has an exclusive category for OCD and related disorders. This one comes from old/outdated sources.
Let's not mention the DID (and other disorders that have been a) fad, that is, that people literally lied about having a mental disorder. These people also exaggerated the symptoms. "My DID causes me to switch every five minutes between my more than a hundred personalities". I mean, nobody in their right mind would think this is medical information, but still, a lot of BS there.
Recently, the "BPD does not exist and it's just a name for traumatized people, especially women" is gaining weight, when it's true that many borderline diagnoses come with a history of trauma, but not all of them. And even if we were to find that trauma is always present, that would make the classification appear in both the disorders caused by trauma/stress and the personality disorders, and studies about the difference between BPD and forms of PTSD would be needed, but the concept wouldn't just disappear because the clinical picture is still useful.
God... I guess this issue is a pet peeve of mine. I feel like I can continue, but this is a wall of text already.
I think excellent information is also on TikTok, like Dr. Tracey Marks and, for Spanish speakers, Dr. Rodrigo Corona. I've learnt some interesting things about PMDD on TikTok, and speculation often leads to interesting research (either already done but rediscovered or new and ongoing research). This is the case for other fields too. This year, I've seen more doctors recommending myo-inositol and berberine as a science-based treatment for PCOS; years ago, social media was commenting on this but doctors were just catching up and research was still scarce. You can see this shift in Dr. Tracey Marks videos, actually. Her latest videos include recommendations like yoga, keto diet, and ashwaghanda. Years ago, this was the equivalent of detox juices and crystal healing for many people, but today we know it has some therapeutic benefits (they aren't cures, they aren't enough on their own, but they help). So... yeah. My point is that there are experts on TikTok sharing good information, and that not all new information on social media is pseudoscience, it's just science on the making, incomplete science, and you can know this because there's some evidence and one just need to wait for more.
The trick is to distinguish the informative "content creators" versus the misleading ones. I believe YouTube has a verification feature for accurate health information; TikTok could (and should) follow.
I've learnt some "hacks" from How to ADHD (both the YouTube channel and the book).
Something that works for me is "bribing" myself. Either with a planner you enjoy filling, a calendar with stickers, or a reward like TV time or music (not food), give yourself a reason to do your activities beyond the activities themselves.
Another one that's not always possible for me, but works, is getting non-negative external pressure. Deadlines often get people to start, but that's too much stress, and we don't want that stress. A similar thing to a deadline without the anxiety is body doubling. It consists of doing your activity while other person or people do theirs, and you can report back in the middle or only at the end. The idea is that you feel like you need to do it because people are counting on it, without it being super stressful. You might feel watched, you might feel their expectatives on you, you might simply want to exchange your results at the end. However it goes, it might work for you. A variant of this is telling your plans to someone important and then you'll feel like you need to do it so you can tell them how it went.
My emergency remedy (only when I'm unmedicated for ADHD, because I wouldn't mix it with my medication): caffeine. Caffeine is a stimulant, so it has interesting effects on people with ADHD. Depending on age, metabolism, and quantity, it can be relaxing or "quieting"; it can also help with focus; and it can give a boost to productivity. A cup of good coffee and I do the laundry, cook, write back to people, etc. Now, be careful because a) you can become hooked to caffeine and become one of those people that cannot function without it, b) even without an addiction, if you use it too much, your body will get resistant for a time and it will lose its effectivity, c) some cannot tolerate caffeine well, for example, people with cardiopathies or bipolar disorder. I cannot drink it for long without causing havoc in my sleep and mood. Be careful with caffeine.
And those are the strongest for me. I do recommend getting the How to ADHD book, even if you're not dealing with ADHD but a mood disorder, a difficult time in your life, etc. The tips are helpful nonetheless.