Twitter

I found this on Twilight Lexicon. Here are the twilight stars that have a twitter account:
Cullen Family Members
Peter Facinelli (also on Twitter is Peter’s fabulous wife Jennie Garth)
Ashley Greene
The Volturi
Michael Sheen
Jamie Campbell Bower
Charlie Bewley
Cameron Bright
Forks Humans
Justin Chon
Christian Serratos
Billy Burke
Anna Kendrick
michael welch : http://twitter.com/mwdotcom
Quileute Tribe Members
Gil Birmingham
Kiowa Gordon
Tinsel Korey
Boo Boo Stewart
Alex Meraz: http://twitter.com/TheAlexMeraz
Other vampires
Rachelle Lefevre
Edi Gathegi
Jodelle Ferland
Directors
David Slade
The Twitters supposedly run by Robert Pattinson, Kristen Stewart, Kellan Lutz, Nikki Reed are all fakes. Ways to tell: mislabeling of photos stating where & when the pics were taken, Tweeting while clearly performing , all created around the same date, claiming they are posting personal photos when in reality are actually recycled paparazzi shots, official sites of actors don’t list a Twitter, etc.
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100 Monkeys The Band Jackson Rathbone plays with
Bobby Long Writer of Let Me Sign along with Marcus Foster, performed by Rob Pattinson on the Twilight soundtrack
Sam Bradley Writer of Never Think, performed by Rob Pattinson on the Twilight soundtrack
Marcus Foster Writer of Let Me Sign along with Bobby Long, performed by Rob Pattinson on the Twilight soundtrack

Official Twilight twitter page: http://twitter.com/twilight

These the are ones not fake ones. Some them may say: verified account. Which means u are definitely following the real one. Some might not have that but it's still the real one.