slayer line

Hi there, I saw this discussion in the Sunnydale Cemetary and would love to resurrect it, at least in spirit. In the season five episode, "Intervention," Buffy is on a quest to find the Slayer's relationship to love. In pertinent part: FIRST SLAYER/Sineya: You think you're losing your...

doesn't it run through faith? or does it not even exist anymore? after the spell willow in chosen. I haven't kept up with the comics at all. isn't there like a hundred + slayers that exist after the spell?

I know there was a rift in the slayer line after Buffy's resurrection, but was The First able to use that to locate the potentials? Or was there an inside source at the Watcher's Council that was feeding the names to it? Also, if there were potential slayers always popping up all over the world...