missive

But Dorsey's missive was emblematic of precisely what many Twitter users fear about a higher character limit: more words, less wit.?Twitter says it's testing the 280-character limit with a small group of users?— and that the limit will remain 140 characters in Japanese, Chinese and Korean

spam bot?

A?spam bot?is a computer program that helps to spread spam across the Internet.

soapbox

a thing that provides an opportunity for someone to air their views publicly.

as of

phrase of as

used to indicate the time or date from which something starts.

"I'm out of a job as of now"

go to bat for someone

If you go to bat for someone or go in to bat for them, you?give them your support.

som·ber

dark or dull in color or tone; gloomy.