It does not come as a surprise that in 2018, Google ranked first in growth for top performing review sources and showed the highest increase in the number of reviews with an impressive plus of 93.37% compared to 2017.

Also, Expedia experienced a very successful year in 2018 and reported double-digit growth in bookings and revenue for the full year compared to 2017 - a whopping +63.45% increase in review volume on a global level.