Using this kirby plugin, your visitors can give single pages a thumb up or down.
Every visitor can do this only once for each page (or change her rating). The plugin also supports webmentions using my webmention plugin (Tratschtante). This way you can tranform twitter likes to positive page ratings.
Beside a snippet for your page, you also get a nice overview in the panel
Information on how to install and configure can be found on GitHub.