Another example, to show off:

By running this code:

    CloudDeploy[
      FormFunction[
        "text" -> "String", 
        Classify["FacebookTopic", #text, "TopProbabilities"] &, 
        "JSON"
      ],
      Permissions -> "Public"
    ]

I get a web form that can be used to enter arbitrary text and have social media topic inferred on it:

https://www.wolframcloud.com/objects/0cda973b-8e12-43d7-a9d3...

Try something like "I just had the most amazing meal at Four Burgers today".