Youtube will show you gameplay of a title
that is known to you. You can't use it to aid your search for some guy asking "I'm looking for that game... you know... with
pink elephant".
IMDb is ill-suited for cataloguing games, they don't even have hardware/OS platform division (it should be in the release info section). Remember that publishers keep using the same title for games which aren't a simple console/PC conversion, but a whole new product.
Wikipedia won't give you minimum system requirements nor complete credits.