Don’t ask for client reviews once. Ask many times in many different ways! You can’t tell when a client will have the time and the focus to do a review. So ask often and make it easy! Here is a good example. Event Espresso is a plug-in for WordPress to organize events and ticket sales. They did a 7 day series of email lessons. At the bottom of #7, they inserted a link to their Twitter profile. They asked for a tweet. This is an easy type of review request. I didn’t have to think of what to write, look up their Twitter ID. Nothing like that! Click on the link and share the word.