Twitter-icon.com has a great selection of twitter icons and buttons.
Site: ngos.net (UN NGOs Network)
The NGOs Network, This site is an index to all NGO activities at the United Nations and links to NGOs outside the UN who are intersted in the UN's Substantative and Thematic Issues.
Do you have a twitter account? If so it's important
to get as many people as possible to follow you.
Great follow me icon captures attention of the visitors
and brings more followers to your twitter account.
Choose great twitter icon for you website!