Posting relevant information is a far cry from hijacking. What you refer to as "pet articles" are on point. If I were to break in and begin a discussion about what laundry detergent best removes axle grease from a poly-cotton blend, well, that would be hijacking. Again, if you want clarification, ask admin. They do more than just zot, after all.
20 pages of AIDS conspiracy theory text is not on the subject of Massachusetts gay indoctrination of children. Post excerpts, post links, fine. But don't throw a whale on top of the tuna casserole at somebody else's party because you like the flavor.