This is a good question and deserves a straight answer, sadly, like with so many things, this doesn't really have a straight answer, but I'll do the best I can.
For starters, let's use an example that I know for a fact is real, so off to youtube! PS: I really don't care what anyone else may say regarding the authenticity of this video. It's real, that's all the needs to be worried about.
Many of you may have already seen this particular video. I can assure you, it's absolutely real. What the man narrating is saying is essentially true and I use the word essentially as every situation is different and rightly so. No two Grey's are the same and that really throws us for a loop, but it's true.
Another tell tale sign (and it's not something you'd think) is when you see these Grey's moving about as if they are puppets on strings or being manipulated by someone else. The sad truth is that they really do move that way because our dimension is far more dense than theirs. In fact, on a side note, the higher you go up in dimensional vibrations, the lighter everything is because the very atoms that make up matter are far further apart yet retain their atomic bods to form matter.
Conversely, the further you go down, the more densely packed those atoms and thus the heavier they are. So when Grey's come into our reality, they are essentially taking on a great weight and it's difficult for them to move about. That's why we have to take care of them at all times to ensure their safety while they're here. At least that's the text-book answer.
So, when watching videos online and you'd like to know if it's real, here's a couple of pointers to help you decide but remember, ultimately, it's really up to you to decide if it's real or not.
- Darkness, look for darkness. If the video isn't darkened, like by a LOT and the alien in question isn't difficult to see, then chances are it's NOT real. They cannot survive in our lighted environments without protection
- The "alien" ALWAYS and I mean ALWAYS moves as if they're being controlled by a 3rd party. If you see something and it's moving smoothly without it's head shaking and otherwise strange movements like that, then it's not real.
Another tell tale sign is the fact that most videos display a Grey but nobody takes notice that the arms and legs are not nearly as spindly as they should be. If the "Alien" in the video has arms and legs like a thin kid or something like that, chances are they're not an Alien. All of the aliens that I've had the displeasure of meeting and or being around sport arms and legs that wouldn't allow for a human to get into, you know, like a suit. So, if you watch a video and you see a "Grey" that doesn't have sticks for legs and arms, then chances are it's not real.
Spotting any kind of "sagging" skin is a dead give away that they're not real. Grey skin doesn't sag, not even when they're dead. There's just not enough of it to do so. They're not fat, they're not even overweight as they have solved all that long ago via their cloning technology. They don't suffer disease or sickness unless they come to a world that doesn't fit their unique physiological needs.
That's about the size of it really. If you have any questions, go ahead, hit me up in the comments, I'll do my best to answer them.