The each() function applies the request to each
matched item. So, in your case, it's going to do just what you're getting: apply a toggle to each item of class forumPaster - that's all of them. Just what it says.
To further confuse the issue, you're binding the click function on every button to do the same thing. So you're doubly telling it to annoy and confound you to no end.
I'm far from a jquery pro, so with the little knowledge that I do have, I'd try a couple of things. First, if your layout implies a parent/child/sibling structure between the buttons and their supposed associated divs, use jquery selectors
to narrow down the toggle action.
If the layout doesn't allow for non-trivial traversal like that, though, you could do it easily by applying IDs to every element and setting up your button/click/toggle combo for each ID. More code, but easy to target exactly what you want.