One of the good things about the new version of Google Sites is that Google has made it much easier to embed content from third party services. Flipgrid is one of the popular ed tech tools that you might want to add to your Google Site. By embedding a fully functional Flipgrid topic into your Google Site your students can record their video replies to your topics while they're viewing your Google Site. In the video that is embedded below I demonstrate how you can include Flipgrid in your Google Site.
Applications for Education
By embedding Flipgrid into a page on your Google Site you are essentially creating a video blog on your Google Site. In a social studies course you might have students post weekly responses to news stories. You could also use it as a place for students to simply share weekly reflections on what they learned in your classroom.