You can now build accurate ratings and charts for content shared via your inline bot.

Simply send /setinlinefeedback to @BotFather to receive updates on which of the results provided by your bot got chosen by its users.

To give just one example, you could use this data to return the top-10 most popular results when a user first types your bot's username in the input field (i.e., as an answer to an empty request).

More info here:
https://core.telegram.org/bots/inline#collecting-feedback
This update:
https://core.telegram.org/bots/api#recent-changes