We have known each other for quite a long time on the dating site but finally managed to go on our first date. We both were silent around each other, and we were shy so not able to talk much. Most of the time we spend just smiling at each other and conveying our replies non-verbally. They say that we should talk a lot on first date, so was it a dud?
I believe that it's only a failure if one, or both, of you don't wanna have a second date. Silences happen, that's normal, especially on a first date, so I wouldn't look too much into that. You can still have a great time together without talking too much.
Go on a second date, see how it goes from there. It's most likely that you'll be more comfortable with each other and will talk more.