It's most likely the first assumption. From what I remember from my 6th grade computer class, Spiders are from what people search on Google. For example, if I search up Dark Sonic on Google Images, Google will find the key words Dark Sonic and it'll most likely pull up a picture of Dark Sonic .wads from here because it matches on what I had searched for.
Correct me if I'm wrong anybody, it's been at least four years since I had learned that.