Tiếng việt nói nôm na vậy cho dễ hiểu, còn thuật ngữ tiếng Anh như dưới các cụ nhé:
Nhà cung cấp Dịch vụ viễn thông:
A telecommunications service provider (TSP) is a type of communications service provider that has traditionally provided telephone and similar services. This category includes incumbent local exchange carriers, competitive local exchange carriers, and mobile wireless communication companies.
While some people use the terms "telecom service provider" and "communications service provider" interchangeably, the term TSP generally excludes Internet service providers (ISPs), cable television companies, satellite TV, and managed service providers.
TSPs provide access to telephone and related communications services. In the past, most TSPs were government owned and operated in most countries, due to the nature of capital expenditure involved in it. But today there are many private players in most regions of the world, and even most of the government owned companies have been privatized.
https://en.m.wikipedia.org/wiki/Telecommunications_service_provider
Ứng dụng trên nền dịch vụ viễn thông, trong trường hợp của FB và GG là:
Communication software is used to provide remote access to systems and exchange files and messages in text, audio and/or video formats between different computers or users. This includes terminal emulators, file transfer programs, chat and instant messaging programs, as well as similar functionality integrated within MUDs. The term is also applied to software operating a bulletin board system, but seldom to that operating a computer network or Stored Program Control exchange.
https://en.m.wikipedia.org/wiki/Communication_software