While it is quite easy to sign up and start adding information to these family tree services, questions about the reliability of the information in any tree will certainly arise for many family historians. Assessing the quality of data represents the beginning of the process. It is through verifying and reviewing the original work referred to in the citation that a researcher can determine the true quality of the source and its citation, and thereby the family tree. Unfortunately, many online family trees are unsourced, and should be considered clues, not facts, until validated with documentary evidence from several sources.
As an online family tree owner, one must also be aware of your rights as the owner of that information. Some online family tree services that allow open editing of tree information do not mediate disputes among their members. For example, a member could copy information from a section of another member's tree and paste it into their own tree, or place information into another's tree. The terms of service or use and the privacy statements available at these service websites outline the respective responsibilities of the service company and the member. A nice introduction and overview of terms of use is available from The Legal Genealogist. Even with these statements, a service company willing to mediate may have particular limits to its involvement in a given dispute. On a practical level, the company would be more than willing to step in if any parts of their service statements are being violated. When considering joining a particular service, be sure to familiarize yourself with your responsibilities, and those of the company, regarding the data you post to that service.
After reviewing terms of service statements on several family tree sites, a lingering question I have is what happens to your data when you no longer want to use the service. Only one company, MyHeritage, has a discussion within its privacy statement about deleting a section of a tree, the whole tree, or the entire account. Other companies are premised on the concept of building a single global tree, and so the expectation is that your data remains after you part ways with the company. If I have missed something in reviewing these statements, I would be interested in constructively expanding my knowledge and post a follow-up.
