[@Bishop]

The spiders can speak to each other - which Bilbo could understand when he was wearing the ring. Evil ring, translates evil language, you get the idea. But I say again, even if you did somehow manage to create a way for it to speak to others, it doesn't fit the setting, or the lore. It has no reason for helping them, it'd be far more likely to just eat them. It's a spider. It's evil.