A new heart icon has been spotted in Google Discover (née Feed), replacing the previous button that triggered the familiar more/less slider for tuning its content to better match your tastes. This isn't just a visual change in iconography, either, as tapping the new heart button doesn't open any menu, apparently and simply indicating to Google that you liked a given piece of content. So far, the change seems to be in limited testing.
Most social and news aggregation services nowadays offer you an easy way to request seeing more or less of something to tune the content to your liking. When Google News launched, the "More stories like this" and "Less stories like this" options for every article immediately caught my eye because such a setting doesn't exist in Google's other news-like service: the Feed. But it seems that Google is aware of that omission and is already testing a way to implement these granular controls.