Hi,
I'm a specialist for this kinds of Websites.
I'm 48 Years old, and i can Provide to you a Website, based on HTML5 and Java Backend. With a mysql Database.
The Services are written in REST, so its easy to build mobile clients later on top.
My last Big Project which i made was www.3sexty.com. This is like Groupon, but the Content are Escort Girls.
I hope to hear from you.
Regards Robert