I knew something about it (like reading expression or something, from watching 'the mentalist'), but i did not know what it was called.
but CMIIW the technique used in the linked app is categorized as 'hot reading' right? because it somewhat gather information from our "browsing history". Somewhat same technique used by google for user 'profiling' maybe?
The hot reading is researching information on you directly which is less relevant in this case as you don't leave implicit traces of "I love reading Konan Doyle" in your researchable browser history. You may have visited some Konan Doyle sites but you can still do it for other reasons than actually liking his books so any such attempt will include a lot of guesswork.
No, it's exactly cold reading, because it tries everything and encourages and watches your reaction (with javascript) to determine which things it was throwing against the wall were relevant to you. It's an ePsychic™:)