Some of the data itself is from the public record, but compiling all of it yourself would be prohibitively expensive. It would take many trips to various libraries, churches, courthouses, etc. in lots of far-flung places in different cities, states, and countries. And that's all before you start indexing, searching, copying, or scanning any records.

Then consider they're hosting all those billions of records, have developed decent software for both building family trees and documenting them with their database of sources, and continually improve their software and increase their database holdings. The only reason they can charge so little is the economy of scale based on their huge userbase.

For me it's mostly just a hobby. I love history to begin with, and my family history is specifically interesting to me personally. Finding out where my ancestors lived, what their lives would have been like, and why they immigrated to America is fascinating to me.

I've read that genealogy is the second most common hobby in America, after gardening. Of course, that depends on how a hobby is defined. I consider reading my favorite hobby. However, for some people, i.e. Mormons, genealogy has religious significance. That's why Salt Lake City, Utah is the biggest destination for many people doing genealogical research.

I've also read that, which really interests me. Don't you find it fascinating that your (or at least some modern Turks) ancestors possibly spoke Hittite or another Indo-European or even Semitic language? I recently paid for a genealogical DNA test, which will tell me more specifically where my ancestors came from. My paternal ancestors immigrated to America from Germany in the 1880s (then Prussia), but there are several clues which point to them actually being ethnically Lithuanian. The area where they lived has been part of Lithuania, Poland, Russia, and Germany in just the last few hundred years.

Actually, every person on the planet is descended from immigrants if you go back far enough.

Census records are released 72 years later, to be exact. Also, although the US Census isn't available until then, many state listings of much more recent births, marriages, divorces, and deaths are available.

Too much data is far more preferable than too little. Back in the old days, before many sources were available online, most searching had to be done by hand, paging through entire paper records until you found a possible match. The earliest online sources were often just indexes to paper records. It made it much easier to find the records, but then you still had to travel to a library, courthouse, church, etc. that might be in another state or even country.

The reason the algorithm is so promiscuous is that it's probably using Soundex to match names. That's a good thing though, as I've found some of my ancestors names spelled in lots of different ways.

Definitely agree, the anonymous reader didn't try very hard. And records for living people are necessarily scarce because of privacy issues.

Actually, just creating and editing your family tree on Ancestry is completely free. And there's no limit to the number of people, AFAIK. The paid service is just for accessing their database of sources and connecting with other users who might have overlapping family trees.

I pay for ancestry.com because they have a huge database of sources online, and probably the largest number of users out of any other family tree websites. It's much more convenient for me to search and view their literally billions of records from the comfort of my own home than going to my local library or LDS center. If I did that, I'd have to copy their records and scan them myself. Ancestry's already done the legwork for me. Also, since they have so many users, I've connected to several other people doing research along the same family lines, which saved my quite a bit of time.

But that's really a non-starter with ancestry.com, they let you export your family tree as a GEDCOM file any time you want, which is the de facto standard file format for genealogy.

I agree wholeheartedly! Currently, I use ancestry.com for my main family tree, but regularly download a GEDCOM file and import it into GeneWeb (locally hosted) for offline access. I've tried several other programs, both open source and proprietary, but GeneWeb is my favorite by far. It doesn't make the prettiest family tree website, but it's easy to use and its functionality is great.

Even though the primary developer, Daniel de Rauglaudre, isn't developing it further right now, it has more features than I use regularly, and it's highly customizable. I'm somewhat tempted to learn OCaml, just to be able to modify this software.