Google loves giving suggestions regarding new apps and games to try out based on your and your friends past activities. With the launch of "From familiar faces," a new section of the Google Play Store, Google is aggregating all its received +1 data into a separate area of its app store for users to browse. To be able to access "From familiar faces," you need to be on Play Store v4.6.17. If you haven't received the update already, wait for a couple of hours and you will.
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