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I am not asking how to save or download the videos from youtube or facebook. All, I need to know is why aren't they cached in browser or system memories. Even if the default size for browser use is set to 10 GB, the videos are never saved.

Is it something to do with the browsers ? Do they don't allow caching or Is it the website offering the content.

One way or the other, there should be reason and what could that be. If browser don't allow, then why ? And if websites don't offer this, then why ?

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-1 As I mentioned in the comments to David Schwartz's answer, this question has a counterfactual as its premise. Videos from YouTube are cached by WWW browsers. (There are plenty of people around the WWW who provide "How to fish YouTube videos out of browser XYZ's cache." instructions and utilities, for everything from Opera to Safari.) So asking for the reasons that they aren't cached is asking for an explanation of something that is not in fact the case in the first place. – JdeBP Dec 6 '11 at 17:33
you haven't understand the question i suppose. There is also another part; Even if the video is cached by browsers then why don't they use it for future viewing. – Pankaj Upadhyay Dec 6 '11 at 17:41
That's yet another counterfactual, kiddo. They will use it for future viewing, as this person noticed two and a half years ago. I strongly suggest that you learn what actually happens before making more requests for explanations of things that are not in fact the case at all. The real world is more complex and subtle than, and is different to, what you are positing as the premises of your questions. – JdeBP Dec 6 '11 at 19:39
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My guess is that this is because of legal reasons. Saving them to cache would be creating a copy of it, which probably violates copyright for lots of videos. Keeping them in RAM could be legal, but it's not really a practical thing. Maybe it's inconclusive if it's legal or not.

I would be really surprised if there were technical reasons to not save them to cache and delete them when the page is closed or when the browser closes or something. After all, there are tools to download the videos with ease.

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Copyright violation came to my mind too but you can stand with this theory when you have ways to get around it. The basic idea is to store them in buffer so that one doesn't need redownload. if browsers or websites are so concerned with copyright concerns then they can manipulate the data such that only browsers can read them when the specific url is pointed. – Pankaj Upadhyay Dec 6 '11 at 10:07
No one is debating the technical feasibility of storing the video. But it is an arms race as each will just find counter measures for the other. – surfasb Dec 7 '11 at 14:29
In Germany and probably other countries as well several video on demand providers began switching from flash to silverlight because it is perceived as more secure (from a copyright point of view) – Morothar Dec 15 '11 at 9:30
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