Wikitree is a bit different to the majority of Genealogy websites out there. It is based on collaboration between members. The idea is to load your family on to the site, either manually or via a GEDcom upload. Then start the process of merging with other common profiles. A merge creates one profile that is shared between the original profile managers.
I have family trees on several Genealogy sites but I find Wikitree is the most satisfying in that the community is strong and supportive and the process is all about a common family tree.
Obviously the greatest feature is that it is free. Also profiles can be locked down to varying degrees of allowable access and therefore privacy is very strong where needed, ie living persons. It is also building very interesting project groups, for geographical areas, for one name studies, for historical events etc.
If there is a negative it is that it cannot find information for you relating to a particular person. Being free it has no ability to obtain records etc, like the expensive paid sites.
As at mid 2015 there are 10.5 million profiles on the site and growing fast, also there are 257,170 genealogists registered.
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