[digitalengineer]

This is not building trust, actually the opposite. This is what fakers would do.

Some time ago I build a startup that required good looking people and even kids in all ages to provide me with their email, several photo's, their location and their (cell)phone number, which enough people did for me to boast about nation-wide coverage in the Netherlands.

If you really want people to give you their details you're going to have to show you're for real. At the very least you should show who is running the show and how a user could connect with you. Email is fine, a likedin profile with a ton of linked people and recommendations is even better and a phone number and address also build trust. Because people see they could phone you up will stop most of them from actually doing so.

Another thing I spend a ton of time on to build trust is the FAQ. Think about what your users worry about and make those worries the top 10 questions. If you have a few bucks make sure your legal stuff is legit as well. I negotiated with a well know IT lawyer and was able to provide me and my users good legal protection. Also blog about everything.