Instagram 的名称取自"即时"（英语：instant ）与“电报”（英语：telegram ）两个单词的结合。因为创始人灵感来自即时成像相机，且认为人与人之间的照片分享“就像用电线传递电报消息”，因而将两个单词结合成软件名称

https://gist.github.com/jboner/2841832

Latency Comparison Numbers (~2012)

DSP：需求方平台 (demand-side platform)

A demand-side platform (DSP) allows buyers of digital ad inventory to manage multiple ad exchanges via one interface. These buyers commonly include trading desks, agencies, or advertisers directly.

To enable these buyers to bid on digital inventory, the DSP has to plug into an SSP. This programmatic advertising supply chain is visualized in the graphic below.