gnome-activity-journal depends on gst-python slot 0.10 which depends on vulnerable gstreamer slot 0.10 which is going to be removed from tree. For more info refer to bug 550648.
Upstream is dead for ages, this also depends on obsolete gnome2 python modules... do we need this still or could we treeclean it finally?
Given the level of activity of the whole zeigeist stack, I makes me sad but I have to recommend treecleaning all of it.
Gone