Good luck with the idea and I believe there's market for that. It will definitely help a certain category of people. But some other people will quickly say they don't like it because they don't want to date friends of their friends. It all depends on the particular person.

I love tomonotomo and actually I have a similar web site for job search/recruitment through connections discussed here, https://news.ycombinator.com/item?id=6327275