signatures footprints are kinda hard to search for in google, you will need to visit the forums and check if the users have signatures.. this will be a manual job, if you don't have time to do it, hire someone to do the research for you.
I entertained the idea of launching a huge dating site, still may actually, have most of it done but in terms of marketing that stuff dating forums is not the way to go. I looked into about 20 of them and not only do they not allow sigs, they are a bunch of raving asshats about it. It has been a while but you can assume it would be 20 good ones, or stuff ranked well. I suspect it gets into forum owners running a dating site or having some advert relationships in place. hope that helps, Nigel
There is no tool or trick to find it, you'll have to do all that manually but yeah you can always try your luck with Google!
you will need to do this manually, unfortunately. That's the only way to find sigs in related forums.
Just make a research by adding your queries on the Google then only you can find the required forum list.