Who doesn’t love a good friendly competition? Asking for reviews needs to become a part of your company culture and what better way to incentivize your employees to embrace online reviews than to run a competition.
Drive the behavior you are looking for by running an eternal competition where employees earn points for each review that they receive. Maybe even offer bonus points if the review mentions an employee by name. Then bucket points into dollar values, so maybe 50 points is equal to $10 for example. Then tier prizes based off of these amounts.