All true! I guess more precise definitions of "popular" could be constructed, but that's the simplest one and I went with it, especially as it isn't particular

All true! I guess more precise definitions of "popular" could be constructed, but that's the simplest one and I went with it, especially as it isn't particularly invasive or creepy (we're just counting how many people have a certain linked part in their database, think of it as a counter per linked part that gets incremented if somebody adds a part and decremented if they delete the part).