Not in my opinion. Social media, YouTube, blogs, etc. are too impersonal and broad to be able to instigate something like that. Just as it is unlikely to instigate healing by watching a video or something on television.
Now, sometimes things we read or watch can be thought provoking, or inspirational, or can cause e.otional reactions like sympathy, sadness, happiness, fright... but those are not magical. It is no different than watching a scary scene in a movie or reading a bittersweet chapter in a favorite book. We connect ourselves with what we are reading/watching. The media doesn't inflict it on us we create it ourselves.
Now, an exception would be in videos or articles where you choose to actively take part. For example listening to a guided meditation on YouTube and acting along with the instructions. Or watching someone talk about how they are 'sending you healing from above' *cue the person thrusting their hands at the camera dramatically* and you actively visualizing receiving such energy. However, even then it is still you creating your experience. You are the only active party in that moment.
Bear in mind that written words, and eve videos are inactive. Yes, even videos. You are just watching a scene play. A tape rewound and re-visited. It is a recording of something someone acted out in the past. While you are watching the memory of that action, the person might be just making toast. Or walking their dog. Or doing any number of things completely unrelated to what you are watching and not committing any thought or energy or intent towards 'affecting' however many people might be watching that video made who-knows how long ago.
So, if you are feeling depressed or 'heavy' after reading or watching something, it may just be that you are dwelling on your experience for some reason. Maybe the information struck a chord ir felt related to you personally. Maybe the opinions expressed bothered or provoked you for some reason. Either way my suggestion is to ask yourself why what you read might be lingering in your thoughts. What is it about what you read/watched is bothering you? Examining why you are feeling the way you do should bring to light what is going on.