This by no means applies to all group owners and admins. Some do a very good job of keeping their groups on-topic--free of articles and seeds that have nothing to do with the group purpose.
Many do not.
The complaints about group spamming are increasing. There are lots of users who do not take the responsibility of proper categorization, which includes posting to groups, seriously. They either don't know what the purpose is of the groups they belong to, or they don't care, and just spam their content to every group to which they belong, in the hopes of getting more attention. That's spamming. And it's more than merely annoying.
I see articles and seeds posted to 10, 20 groups. That's too many. Political articles posted to groups about race and ethnicity, when the article has nothing to do with race or ethnicity.
This group spamming habit, this self-promotional crap, destroys groups.
Unfortunately, we can't solve the problem of group spamming just by exhorting users who do it to stop doing it. We should be able to, but we can't. Who we really should be pointing the finger at is group owners and administrators, whose job it is to keep their groups on-topic.
I'm charging you, group owners and administrators, to start paying attention to your groups. If you have too many and can't monitor their content, find someone who can, let me know, and I'll transfer ownership for you. It is your responsibility as a group owner, and/or as a designated group admin, to maintain the group properly.
Dump content that doesn't belong. Boot users who repeatedly spam your group. If you can't or won't do it, you shouldn't have the privilege of owning a group.
Group members who see content that doesn't belong in your groups--you should be contacting the group administrators and asking them to remove it. Post a comment on a group thread of an article that doesn't belong in the group and say "Hey, this article about Obama's smoking habit doesn't belong in Rightwingnutjobs. Please edit and remove it from the group. Thank you."
We may, in the future, have to start taking a stronger stance on this issue, by going in and dumping relentless group spammers from the groups they're spamming. Or even by removing the ownership of the groups, perhaps going so far as to just delete the group entirely.
Group ownership should be viewed as a privilege, not a right.
And as for you group spammers: cut it out. Start paying attention to the guidelines of the groups to which you belong. If you belong to so many that you can't keep track of what the purpose of those groups is, then you need to remove yourself from the group.