Maybe a "google expert" on site-links can explain this one for me. When I search for "trade show booths" on google (which I do on occasion), the #1 and #2 spots have site links, which I understand, the #3 spot doesn't, which I again understand, but then the #4 site does! How can the #4 site have site links if the #3 site doesn't??? I've seen this happen on searches besides "trade show booths", but that's the search I'm most familiar with.
Any ideas? Thanks in advance for any insight or google wisdom on this.