#1: 207476 (160365) Penguin Books (UK) @PenguinBooks (Listed 5059)
#2: 147841 (117026) Penguin Group (USA) @penguinusa (Listed 3452)
#3: 147632 (112883) Random House @randomhouse (Listed 4181)
#4: 103221 (82243) Little, Brown and Co @littlebrown (Listed 3004)
#5: 86764 (60439) Simon & Schuster @simonschuster (Listed 3042)
#6: 73266 (57573): Alfred A. Knopf @AAKnopf (Listed 1876)
#7: 65887 (49449): Algonquin Books @AlgonquinBooks (Listed 1450)
#8: 61238 (42852) Tor Books @torbooks (Listed 2100)
#9: 46239 (29438): Unbridled Books @unbridledbooks (Listed 918)
16136 (15474): Chelsea Green @chelseagreen (Listed 811)
1288 (11126): Vintage Books (UK) @vintagebooks (Listed 1041)
11699 (9854): Bloomsbury (UK) @BloomsburyBooks (Listed 1007)
9503 (7903): Faber and Faber (UK) @FaberBooks (Listed 845)
7506 (6764): Orbit Books @orbitbooks (Listed 781)
7377 (5674): Doubleday Publishing @doubledaypub (Listed 684)
7279 (6272): Scribner (Simon & Schuster) @ScribnerBooks (Listed 739)
7089 (6641): Random House Canada @RandomHouseCA (Listed 579)
6536 (5186): Pantheon Books @PantheonBooks (Listed 598)
6457 (5090): Melville House @melvillehouse (Listed 597)
6258 (5750): Sortis Publishing @SortisBooks (Listed 113)
6254 (4997): Pocket Books (Simon & Schuster) @Pocket_Books (Listed 585)
5912 (5211): Random House Digital (UK) @RandomDigital (Listed 518)
5801 (4796): Canongate Books (UK) @canongatebooks (Listed 485)
5755 (4421): Free Press @freepressbooks (Listed 502)
5436 (5232): University of Toronto Press (Canada) @utpress (Listed 349)
5068 (4079): Tor.com @tordotcom (Listed 647)
5002 (3966): Atria Books @AtriaBooks (Listed 378)
#45: 4724 (3600): Bloomsbury USA @BloomsburyPub (Listed 450)
4678 (4131): Transworld Books (Random House) (UK) @TransworldBooks (Listed 439)
4334 (3619): Ebury Publishing (UK) @eburypublishing (Listed 328)
3764 (2552): Grove Atlantic, Inc @groveatlantic (Listed 285)
2990 (2320): New Directions @NewDirections (Listed 242)
2757 (2351): Dzanc Books @DzancBooks (Listed 300)
2481 (2298): House of Anansi Press (Canada) @HouseofAnansi (Listed 312)
1880 (1828): Heinemann Publishing @NewAtHeinemann (Listed 113)
1776 (1636): Amulet Books @AmuletBooks (Listed 160)
1776 (1612): It Books (HarperCollins Publishers) @youritlist (Listed 98)
1776 (1636): Amulet Books @AmuletBooks (Listed 160)
1776 (1612): It Books (HarperCollins Publishers) @youritlist (Listed 98)
667 (500): Cormorant Books (Canada) @cormorantbooks (Listed 84)
643 (525): BL Publishing (UK) @BL_Shop (Listed 71)

This is the new "journey" of the ranking also known as the World Series/League of Publishing Houses @Twitter. Always in the 1st Saturday of each month (now quarter), the top Publishing Houses in Twitter is created from the number of people who "follow" the profile of a Publisher of Books on Twitter.
Notes: Up

News:
1. The next edition will be in June 2011 (Top is now held quarterly, alternating with the Top Editoras no Twitter, Publishing Houses from Portugal and Brazil)
[Archive: 1st Edition, 2nd Edition, 3rd Edition, 4th Edition, 5th Edition, 6th Edition, 7th Edition,8th Edition, 9th Edition, 10th Edition, 11th Edition, 12th Edition, 13th Edition]