Listen to all the whining and screeching about ads online just at this website. Read the convoluted measures some take to keep ads from inflicting themselves upon their retinas.
Voice chat? Yet another toy.
Startup funds are irrelevant to long term viability. This has to make money as an ongoing operation, and the environment for any ad-supported "free" service on the Internet is extremely hostile. You won't be re-investing negative profits...and at some point that startup money wants its due. -- Toolmaster of La Grange. The Buck Starts Here.