I think "spiders" means bots of some kind which visit your board. I'm sorry I don't know much about how these things work or the right language to discuss it. But sometimes I come here kind of late at night and I see x number of "guests"; I think there is a way of differentiating between the guests who are people and the guests who are automatons. Of course, I don't know what that way IS ! But I've seen it done on another board. Not a real big deal but it would be interesting. Also, maybe there could be that feature for keeping track of how many had "viewed" a thread. In any case, I think this is a great board already.