Twitter-icon.com has a great selection of twitter icons and buttons.
Site: actionaid.org.uk (ActionAid UK: End poverty. Together.)
ActionAid's vision is a world without poverty in which every person can exercise their right to a life of dignity. We are an international development agency working with poor and marginalised people to eradicate poverty by overcoming the injustice and inequity that cause it.
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!