#1

charitywater charity: water 1,105,008 followers (31 on this list)
Bio charity: water is a non-profit organization bringing clean and safe drinking water to people in developing nations. www.charitywater.org
Location New York, NY - London
Web http://www.charitywat...
Other lists:  water

#2

TwitCause TwitCause 321,652 followers (23 on this list)
Bio TwitCause helps nonprofits get discovered on Twitter and enables passionate people to support the causes they care about.
Location San Francisco
Web http://www.twitcause....
Other lists:  causes, charity

#3

nonprofitorgs Nonprofit Orgs 114,660 followers (66 on this list)
Bio The mission of this Twitter profile is to serve as a portal to all nonprofit organizations on Twitter [by only following nonprofit organizations].
Location Springfield, MO
Web http://nonprofitorgs....
Other lists:  charity, fundraising

#4

kanter Beth Kanter 108,740 followers (40 on this list)
Bio Social Media, Nonprofits, and Networks
Location 
Web http://tinyurl.com/3q...
Other lists:  philanthropy, social-media, socialmedia

#5

creativecommons creativecommons 106,428 followers (7 on this list)
Bio Creative Commons is a nonprofit corporation dedicated to making it easier for people to share and build upon the work of others, consistent with the rules of ©.
Location We're international.
Web http://www.creativeco...
Other lists:  creativity

#6

dosomething Do Something 102,598 followers (24 on this list)
Bio DoSomething.org helps young people rock causes they care about. (Tweets by CEO & Chief Old Person @nancylublin )
Location NYC, NY 10003
Web http://www.dosomethin...
Other lists:  ceo, ceos, socialentrepreneur

#7

acumenfund Acumen Fund 97,272 followers (21 on this list)
Bio Solving poverty through business, innovation, and by providing dignity and choice for the poor. Also follow our founder & CEO @jnovogratz.
Location NYC, East Africa, South Asia
Web http://www.acumenfund...
Other lists:  ceos, founders, innovation, poverty

#8

socialcitizen Kari Saratovsky 95,748 followers (24 on this list)
Bio VP Social Innovation @CaseFoundation & evangelist for all things social media 4 social good
Location San Francisco, CA
Web http://www.socialciti...
Other lists:  evangelism, innovation, social-media

#9

Kjer Kjerstin Erickson 94,278 followers (6 on this list)
Bio I run FORGE, a nonprofit organization that facilitates and supports social entrepreneurship in African refugee communities.
Location Oakland, California
Web http://www.FORGEnow.o...
Other lists:  social-entrepreneurship

#10

AshokaTweets Ashoka 82,846 followers (30 on this list)
Bio Ashoka is an international citizen-sector organization which is leading the way to an Everyone a Changemaker World. Tweets by @tomjd and friends.
Location Washington DC
Web http://www.ashoka.org
Other lists:  international-business, socialchange, socialentrepreneurship

#11

WildCare WildCare 82,793 followers (3 on this list)
Bio We are a non-profit organization with a wildlife hospital, nature education programs for schools and individuals, and a wildlife solutions service.
Location SF Bay Area, California
Web http://www.wildcareba...
Other lists:  health, hospitals, nature, pets

#12

EcoInteractive EcoInteractive 81,703 followers (15 on this list)
Bio Eco Preservation Society: Inspiring Action, Empowering People,Connecting Communities & Transforming the Planet through Conservation, Reforestation & Education
Location Costa Rica
Web http://unhub.com/EcoI...
Other lists:  conservation, environment

#13

peta PETA 52,609 followers (11 on this list)
Bio Sexy celeb supporters, PETA antics, shocking videos, vegan recipes & more!
Location Norfolk, Virgina
Web http://www.peta.org?c...
Other lists:  animals, food, green!, recipes

#14

TWLOHA TWLOHA 47,818 followers (5 on this list)
Bio TWLOHA is a non-profit movement dedicated to presenting hope and finding help for people struggling with depression, addiction, self-injury and suicide.
Location Cocoa, FL
Web http://www.twloha.com
Other lists:  addictions, blogs, web

#15

ChasL Charles Lauller 45,754 followers (5 on this list)
Bio Avoiding procrastinating, passionate about PB and J's, website therapist, Interactive marketing strategies/solutions, Web Design, Dev, SEO, SMO, SEM, and ORM
Location Austin, TX
Web http://www.agency323....
Other lists:  ad-agencies, branding, christianity, internet, marketing, marketing-consultant, ministry, newmedia, socialmedia

#16

LIVESTRONG LIVESTRONG 45,131 followers (20 on this list)
Bio
Location Austin
Web http://www.livestrong...
Other lists:  causes, news

#17

prsarahevans Sarah Evans 40,099 followers (10 on this list)
Bio I also tweet at @journchat, @sarahevans4good and @sarahevansCHI.
Location iPhone: 42.043259,-88.289780
Web http://prsarahevans.c...
Other lists:  blogger, business, contests, crowdsource, journchat, media, online, publicrelations, socialmedia

#18

johnmcginn Dr. John McGinn 34,230 followers (4 on this list)
Bio Executive Coach, Life Coach, Leadership Coach: Helping others live a more compelling, goal-oriented life, filled with significance and success.
Location North Texas
Web http://www.iandscoach...
Other lists:  coach-executive, coach-life, leadership, professors

#19

jonhutson Jon Hutson 31,166 followers (5 on this list)
Bio News on human rights and justice. Innovative thinking about strategic communication for nonprofit groups. My views, not necessarily my employer's.
Location Washington, DC
Web http://www.linkedin.c...
Other lists:  communications, genprev, globalhealth, human-rights, humanrights, justice, progressive, socialmedia

#20

Heritage Heritage Foundation 28,962 followers (2 on this list)
Bio A think tank devoted to the principles of free enterprise, limited government, individual freedom, traditional American values, and a strong national defense.
Location Washington, DC
Web http://tr.im/mtj7
Other lists:  blogger, defense, government, tcot