The TechCrunch web site has an interesting comparison between online sites MyHeritage and Geni. The article starts with, "Israeli startup MyHeritage was a bit of a sleeping giant. Until newcomer Geni came along and shook up the genealogy world with its slick new viral family tree application. Geni quickly reached 5 million people profiles and a monster $100 million valuation just a few months after launching."
Later the article describes MyHeritage as "The information was viewable online but no changes could be made. An unwieldy system, but they still managed to gather 150,000 family trees with 180 million people profiles from 17.2 million users. 150,000 new profiles are added daily. That dwarfs Geni, although MyHeritage had a long head start.
"A couple of weeks ago MyHeritage unveiled a number of fundamental architectural changes to their service. They've taken the best features of Geni and married them to the stuff at My Heritage that has worked over the past couple of years."
The full article is much longer and provides an interesting comparison of these two genealogy-based social networking sites. You can read the entire article at http://www.techcrunch.com/2007/08/28/myheritage-takes-180-million-people-profiles-to-war-with-geni.