Ok, so after using Snapchat for a while, I've decided that it is actually at least a little useful in Social Circle. I've noticed that when I post funny or clever stories, it basically keeps me "in touch" with people who otherwise probably would have forgotten about me. Particularly, I've noticed that when I ask for something from someone on my Snapchat who consistently views my stories, they're usually more receptive.
Ex. There have been many cases where I asked people I had met only once or twice if they know of any parties, and they'll usually be neutral at best when replying (sometimes, they won't reply at all). Once I started using Snap, they were usually pretty excited to meet me there, and they sometimes even invited me on their own.
I only just added girls I'm interested in today. I suspect that some of the ones I lost (but are still a part of my loose social circle) will be more receptive to me after a while, and the ones who I haven't escalated with yet will be more receptive to me when I next see them.
In any case, it's not very time consuming at all, and it's pretty fun. So when all is said and done, even if it helps me get ONE girl, I think that would make it worth the trouble.