The conclusions seem pretty unanimous that a tablet or a smartphone is used to read certain type of content at specific time and day. (使用者會在特定的時間點、閱讀特定的內容主題、使用特定的device)
Take FT.com's user consumption for example,
Users tend to use tablet devices at the breakfast table (around 7 am). Then the consumption reaches the peak for smartphone use at commuting (between 7 to 9 am). During the office time, the usage of desktop site is back to the field. However, after 9 pm in the evening, the tablet and smartphone devices return to the domination once again.
The consumption of FT content on devices takes turns like
tablet -> smartphone -> desktop -> tablet & smartphone
Moreover, according to FT's analytics, the sections read on the tablet include Weekend, Personal Finance/Comment, World, while World, Companies, Markets, Comment are the main content read on the smartphone.
To combine the findings of the data collection, presumably people would like to read the articles regarding personal interests and leisures through tablets. Once they set out to the office, they would start to learn the relevant information and connect with the world news. The devices used are related to their behaviours: when you just woke up on your warm comfortable bed, no wonder a tablet fits best in the cozy atmosphere, but for commuting, it is easier to use a mobile phone rather than a bigger device. And desktop computer is a work-oriented device for sure.
Using data analytics becomes an interesting and useful design method, just like observation of search keywords is a marketing tool for learning trends and human behaviour.
Therefore, when it comes to responsive web design and content arrangement, users' behaviour and goals across different platforms are worth considering.

Image source: How to Design a Mobile Responsive Website