(informal)in a state of agitation or excitement(非正式)十分激动；非常紧张
英语六级真题
More than that, Apple—and, in different ways, other tech companies, including Google, Facebook, Twitter and Microsoft—have made their opposition to the government's claims a point of corporate pride.
2017年12月六级真题（第三套）阅读 Section B
Online services like Facebook, Twitter and the like, are called out as masters of manipulation—making products so good that people can't stop using them.
2017年12月六级真题（第一套）阅读 Section B
The more people are on their phones, the fewer people are talking until finally you're the only one left not reading email or checking Twitter.
2017年12月六级真题（第一套）阅读 Section B
柯林斯高阶英汉双解学习词典释义
VERB
(鸟)吱喳，唧啾
When birds twitter, they make a lot of short high-pitched sounds.
If you say that someone is twittering about something, you mean that they are speaking about silly or unimportant things, usually rather fast or in a high-pitched voice.