Try to create a thread in the Services Section of this forum (here is the link: https://bitcointalk.org/index.php?board=52.0). Though it's unusual to see such kind of service there, but it falls under it so it's fine . But if you think this forum is still not enough to endorse your service then much better to use the one with larger auidence like FB (I doubt you don't have one). For sure it would be more effective since you can spread the news not only to bitcoiner like us but also to those simple individual while in return you are also promoting the ise of bitcoin. What a win-win situation, isn't it ?