Twitter-icon.com has a great selection of twitter icons and buttons.
Site: seilevel.com (Requirements Defined (sm) - Seilevel)
Your software project is essential, but today delivery seems impossible. With Seilevel as your partner you will succeed. We have the discipline and experience to solve your complex software problems in the fastest possible time.
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!