Twitter-icon.com has a great selection of twitter icons and buttons.
Site: search.usgs.gov (Search USGS)
Search tools and resources to quickly find USGS information.
Hosting company: US Department of the Interior
Tags: Web page, Frequently asked questions, Additional information, Earth science, Library catalog, Current information, U.s. government, U.s. geological survey
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!