You can now "like" shared pictures, videos and albums in Google Photos
Tap the heart icon to like a shared photo, video or album
The heart icon is appearing on new images shared after the Google Photos app on your phone received the update containing this feature. Some Android owners started to report seeing this capability late last month, so if you don't have the heart icon now, you should receive it soon.
Google Photos gives you free unlimited storage of photos for free (16MP and in 1080p HD). This allows you to free up space on your device by deleting the photos stored on your phone or tablet. The app includes 14 filters to help you personalize your photos. And you can share your photos to any email address, phone number, or contact directly from the app.