I guarantee you that "frantic fred" above would want the world to know that he made a low-rider out of a 64 Imperial and hotrodded a Unimog. Half of it is an ego trip anyway. A hotrodder begins with the idea that he or she can improve on what a multi-billion dollar industry produced. Then they want to show off the work. Those who go to the trouble of creating and filling a journal have already demonstrated that they are at least somewhat motivated to present their work to the world.
The ones who would not put something in such a summary, after seeing that it is used to get more people to look at the journal, are probably the ones who would start a journal and let it stagnate anyway. There could be some kind of prompt at the time of starting a journal to get an initial description summary. I think after that it would be updated whenever the journal maker has something he or she wants everyone to notice.