Twitter-icon.com has a great selection of twitter icons and buttons.
Site: clrc.ac.uk (Leading world-class science in the UK)
The Science and Technology Facilities Council or STFC supports and funds science & technology in a broad cross-section of the UK research community as well as in education and training
Hosting company: Science and Technology Facilites Council
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!