My list isn't as long as Audrey Watters's, weighing in at only 23 pages (to her 33). Note that all of these companies are wasting their money, as I block all Twitter advertisements.
Twitter says: "Tailored audiences are often built from email lists or browsing behaviors. They help advertisers reach prospective customers or people who have already expressed interest in their business.Learn more
You are currently part of 2689 audiences from 1338 advertisers.
You can opt out of interest-based advertising in your personalization and data settings. This will change the ads you see on Twitter, however it won't remove you from advertisers' audiences."
Twitter is on the bubble. I don't expect I'll be using the service by the end of the year.