Short answer: No. Long answer: Nope. Now don't get me wrong, i think it'd be cool of they WERE real, and i'd be one of the first to hang out with the ghosts because just how fucking bored wouldn't they be? There are just too many problems for me to believe in it, though. First of all, anecdotal evidence doesn't cut it for proving such things. You might well have experienced some weird shit, but if you were the only ones around, there's not really much credibility to it, is there?

Secondly, there's this issue: The number of people currently alive is UTTERLY DWARFED by the amount of people who have once lived. So, do ghosts die or fade with time, and if so, how long would this take? What makes a ghost "spawn", and how often does it happen? Do animals spawn ghosts? If no, why not? Even if it's (somehow) only humans that spawn ghosts, where does the evolutionary line for "human" go (creationists can safely ignore this question)? You have to remember, if we fast forward 100 years from now, almost every living person today would be dead, and that would be a LOT of ghosts even if it's only one in one thousand that fits the criteria.

But, let's be fair here and say that we know ghosts can only last up to 6-ish years (even though haunted houses supposedly remain so for a LONG time). Going by this particular source, there were around 2,6 million deaths during 2014 in USA alone. If we simplify this massively, let's just multiply that by 6 and get 15,6 million dead people in the last 6 years, in USA, most likely with a much higher concentration in densely populated cities rather than cottages in the ass end of nowhere. That is a lot of potential ghosts. USA is a large place, but with the sheer (and no doubt tragic) amount of people dying all the time, this oughta result in a lot of ghosts, spectres, banshees, apparitions and what have you. Even then, we have no reliable evidence for their existence. The fact that some people claim that skepticism drives them away doesn't exactly help matters.

Mind you, those are numbers for USA; China and India would have SEVERE ghost problems if it was any more than one in a million who spawned a ghost, and let's not forget the abject horrors of nazi concentration camps, where A LOT of innocent people were callously murdered like animals. If that doesn't spawn ghosts, i don't know what will.