Google has an interesting automatic prediction API:
https://developers.google.com/prediction/

It has an easy to follow hello world which predicts the language(ENGLISH/SPANISH/FRENCH) of the given sentence:
https://developers.google.com/prediction/docs/hello_world

In the hello world example, one thing that was confusing was ‘Switching to private mode’. For that, you just need to turn on OAuth 2.0 on the top right of the api console. Clicking ‘ON’ pops up a window. Just clicking confirm enables private mode.

Following is an example of Request / Response for sentiment analysis.

Request:

Response:

People without machine learning background can easily use it for recommendation, spam filtering, or any other prediction purpose.