[quantisan]

Here's my experience.

I was on FounderDating for at least a couple months last year actively looking. (I am speaking from a tech cofounder perspective.) During that time, a few emails were exchanged with a few prospects and a couple Skype chats were made too. But nothing came about from it.

Then instead of waiting any longer I decided to go ahead myself and just keep an eye out as I go. Soon afterward I serendipitously found another startup doing something similar to what I was trying. I contacted them just to exchange ideas. Turns out they were looking for a CTO. So here I am now.

My takeaway is that these are not magic bullets. They are one of many available channels in a co-founder search. The only thing that works is that you need to be "out there" looking. Both on- and offline.