Question: How many digital downloads have been sold?
About the article "Everybody Talks", section "Abstract".

Candidate passages:
States initially were slow to enact taxes on digital downloads, but with recent downturns in tax revenue caused by consumers purchasing more digital downloads, many states have sought ways to impose taxes on purely digital transactions.
There are multiple ways that downloads are taxed.
Some states use their existing franchise, sales, and use taxes to tax purchases/uses/transactions of consumers of Internet goods and services.
Other states enacted laws specifically aimed at digital downloads. 
The song has sold 2,111,000 downloads in the digital era. 
Track listing.
Extra download tracks.
Three extra tracks have been released as downloads only, by different vendors:  "Kozmic Blues" - iTunes  "How Sweet it is to be Loved by You" - available on Tesco Digital download  "By the Light of the Magical Moon" - free download from The Times  
As more commercial items have moved toward becoming born-digital, the face of certain industries has begun to change and adapt.
Some of the most affected are in relation to books, periodicals, and music.
The e-book sector of the book industry has flourished in recent years, with increasing numbers of e-books and e-book readers being developed and sold, and rising numbers of books being born-digital.
Giving in to this trend, some publishing houses, including major ones such as Harlequin, have formed imprints for digital-only books.
Publishers who adopt these digital imprints see opportunities to save costs on things such as printing.
However, this e-publishing also gives authors more independence from their publishers, because the digital marketplace creates a more direct connection between authors, their works, and the audience.
Similarly, journal publishers have seen advantages to born-digital publications.
Increasingly institutions are more interested in subscribing to digital versions of journals, something observed as some scholarly journals have unbundled their print and electronic editions and allowed for separate subscription; these trends have created questions about how economically sustainable production of print versions is.
Already, some major journals such as that of the American Chemical Society have made significant changes to their print editions in order to cut costs, and many see a move toward exclusively digital journals as on the horizon.
These trends have spilled over into the magazine industry as well.
PC Magazine went "100% digital" in early 2009, explaining "...that the ever-growing expense of print and delivery was turning the creation of a physical product into an untenable business proposition."
The music industry has changed dramatically with the increase in digital music, specifically digital downloads.
There has been a dramatic increase in download activity in the new millennium, signaling changes in buying habits.
The digital format and consumers’ growing comfort with it has led to rising sales in single tracks.
This growth is clearly still underway, with all of the ten best-selling singles since 2000 having been released since 2007.
This does not necessarily signal the demise of CDs, as they are still more popular than digital albums, but it does show that this changing born-digital content is having a significant influence on sales and the industry. 
The song debuted at number 32 on the "Billboard" Hot 100 with 108,000 copies of digital downloads sold.
Following the release of "Artpop", the song sold 3,174 digital downloads to debut at number 76 on the UK Singles Chart.
It has sold 21,016 digital downloads in South Korea, as reported by Gaon.