Well, Bob, family history in this internet age is a real community. The growth of sites like Rootschat, Genes Reunited and Ancestry means that you can find relatives, however distant, and "talk" to them via boards like this or via email and swap information. For instance, I "met" via G-R a fellow descendant of the Chandlers (the family Eliza Armstrong 1836 married into) who has provided me with the inscriptions from Eliza's headstone and that of her husband George, and I even have a photo of the memorial urn for my great-great aunt Louisa Chandler.
I have found Rootschat in particular to be incredibly useful. Folk like David (bedfordshire boy) and John give up hours of their own time to help others, and for my Cambridgeshire brick walls I had a huge amount of help from Keith Sherwood, another Rootschatter, who diligently pored over parish records for me (and a hundred others!) and produced masses of information.
The enormous growth in the popularity of "doing your family tree" has coincided with a vast increase in resources available online.
When I started just 7 years ago, the IGI and the LDS 1881 census were about the only available online sources.
Now we have census information from 1841 to 1901, with 1911 coming soon. Many family history societies are publishing parish record transcriptions on CD (I am involved with transcription for Kent FHS at the moment). People are submitting their family trees to Ancestry and Genes-Reunited in ever increasing numbers. Subscription sites give you access to archives like Boyds Marriage Index and Pallotts. And of course, for more recent history, the amazing FreeBMD is now nearly complete before about 1910 - a fantastic finding aid which lets you pinpoint certificates. FreeREG is planning the same task with parish registers, and in a few years time there will hardly be any need to visit a records office or book out an LDS film at all....
All of this makes it easy. People coming fresh to family research these days think it SHOULD be easy - and will often take the "easy" route. The much-cited parentage of William Armstrong b 1792 is a classic case - the only William in Bedfordshire on the IGI that fits that birthdate is William b in Upper Gravenhurst to Thomas and Phoebe. Ergo, he must be the one - even though his birthplace is given as Ravensden in the census info, and he spent his life living just a few miles from Ravensden at Wilden and Thurleigh. Once this is picked up on by others researching the same family, it is taken as fact. Even JohnP fell foul of this one!
My neighbour is fascinated by the length of time I spend messing about with my family - she said "Can I look for MY family tree on the internet?". I said: "It's not quite that easy - you will be able to find individuals through the census and the GRO records, but no-one will have done your tree for you!" WRONG! We sat down at my computer with a few basic facts about her granny, and after a couple of hours of census/BMD-hopping, had an outline going back to 1837. Then a quick Google hunt found a tree stretching back from one of her ancestors in the 1851 census all the way to 1650....and 2 separate matches on Genes-Reunited gave us similar datasets for other branches (and put her in touch with a long-lost cousin!) In just one afternoon's work, we did what it had taken me about 4 years to achieve with my own family!
And this is where the problem lies today.
I have stressed to my neighbour that it isn't enough to take other people's info at face value - she must find those links herself and be confident of them, and she must send for the certificates etc so she can be sure that the post-1837 links are all correctly made. But I doubt she will go to the trouble.
My quick afternoon's work could contain countless errors and mistaken links, and if she ever publishes the existing tree on Ancestry or G-R, all those errors will get out into the public domain, where they will be mistaken for fact.
Which is why it is so important to check and check - or enlist the aid of kind people like Rootschatters who will help.
Having said all that I am now convinced enough that John Armstrong who died in Ravensden in 1826 was the John Armstrong born to John and Edy Grange in Wilstead in 1760/1761 that I have joined him and his forbears up with the rest of my tree.