Comparing the Genealogy Giants: Ancestry.com, FamilySearch.org, Findmypast.com and MyHeritage.com.
The "genealogy giants" all provide audiences with tools and records for researching family trees online. They offer access to billions of historical record images, from newspapers to censuses to baptismal registers from the United States and around the world. They offer the ability to build your family tree, explore other people's family trees and even collaborate with fellow descendants. But they aren't all the same. Their record selection, geographical coverage and user bases vary widely. And two of them also offer the ability to integrate DNA discoveries with what you learn from old records.
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