the class on 9.12

In this class I learned about zotero ,which is something like online database which provides he information of books and journals or even music.It is also possible to store the data online. I have never used it yet . However , I will get used to soon. In addition to this , I learned  how to book the office hour of Rab. google provides really good service, but i am concern about user's privacy information. According to Google Privacy policy, they can gather the information that what webpage do we see and when do we call to whom.These information is held by one private company . I wonder how do they use these info.