VOA慢速英语:Facebook Launches More Mobile App

notify – v. to tell (someone) officially about something

network – n. a system of computers and other devices (such as printers) that are connected to each other

app – n. a computer application

mobile – adj.  able to be moved

optimistic – adj. having or showing hope for the future : expecting good things to happen

analyst – n. a person who studies or analyzes something

site – n. a website or place on the World Wide Web that contains information about a person, organization, etc., and that usually consists of many Web pages joined by hyperlinks

subscribe – v. to pay money to get a publication or service regularly

smartphone – n. a mobile phone with an advanced operating system which has features of a personal computer