When you join a surname project at WFN, you are joining with others who are researching their surname history. When we receive the results of your test, we report the comparison of results on our Results page. We prefer to list the result with the earliest known ancestor and identity number.
We don't list your name, your kit number or your email address. If someone asks to contact you, we reply to them that we don't give out email addresses, but will bcc you on the reply - letting you know of their interest. (unless they are a person who is matching you in the FTDNA database - where you allowed comparisons - in that case, they already have your email address - and we will use it openly with them)
If you change your preference to allow comparisons only within your surname project, it will only show your name and email address to other project members who match you. That doesn't change our handling.
Another way to link up with others researching your surname is through a comparison of pedigrees. If you provide your pedigree, we will post it (along with your name and email address) on the Patriarch page and note that this pedigree goes with result for your identity number. We stop pedigrees at 1900, so it will only identify your ancestors to that point. It will not be clear whether you were tested - or if it was some other male in your family. If you don't provide your pedigree, you aren't identified by name or address on our site.
Another way to interact with others researching your surname is through our forum, where you can post questions or comments, and our project websites, where you and others in the project can share information and showcase results.