What I think happens, and it gets me sometimes too, is that with some searches, you're just looking for quick answers and you end up just bouncing after that first hit without really double-checking other sources. Maybe the people in the study just do a lot more of those quick, short-answer searches.

If it's something like the myriad questions I come across while teaching my kids or living life (from today: which was built first, Eiffel tower or statue of liberty?, vinegar or bleach for cleaning ac drains? what time does x store open?) summaries usually fit the bill. I would guess they ate a big portion of that kind of searching.