Currently AdRiver is showing up on some pages I view but not others, and I have not yet detected a reliable pattern. I have also not been able to find an appropriate changelog entry to get a peek at the code.
While I'm seeing this, I'm logged into a permanent account and also did the admin console tracker opt-out many years ago (that in turn led to being opted out of the Driving Revenue stuff without any documentation to that effect for those of you who remember that troubleshooting process). I'm using both Ghostery and AdBlockPlus when I view LiveJournal and do not have Flash installed.
This seemed like an appropriate community to use to gather more information and try to figure out the actual tracking pattern and intent. I apologize if this is off-topic and would appreciate re-direction to a more suitable community.