How much we can learn from Google search data

I just finished the book Everybody Lies: Big Data, New Data, and What the Internet Can Tell Us About Who We Really Are by Seth Stephens-Davidowitz, which is a highly rated book. The author devoted a great amount of text to the Google Trends data. My fun part of reading this book is that I could dig the results from the Google Trends website myself. Here is one example: in the book the author argues that Google search reveals that contemporary American parents are far more focused on their son’s intelligence than on their daughters.