Howard Rheingold and a number of other Internetizens are curating a great list of resources that should help you sort the information wheat from the chaff online.
The (current) full list is available as a Google Doc.
It does have a slightly American flavour but as a living document there is always the option to suggest your own, local additions.
It includes links to Whois services, Google Image Search, various Factcheck websites, Snopes, the WayBack machine and many more.
Certainly a great place to start if you’re reading something online that doesn’t quite ring true.