Twitter-icon.com has a great selection of twitter icons and buttons.
Site: ciw.uni-karlsruhe.de (Fakultät für Chemieingenieurwesen und Verfahrenstechnik an der Universität Karlsruhe (TH) - Die Fakultät heißt Sie willkommen!)
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!