From the Examiner:

Extra has put together a list of the Twilight cast members who tweet. So here you go Twiards!

Twitter accounts for the whole Twilight cast.

Peter Facinelli (Carlisle Cullen) www.twitter.com/peterfacinelli

Ashley Greene (Alice Cullen) www.twitter.com/ashleymgreene

Anna Kendrick (Jessica Stanley) www.twitter.com/annakendrick47

Justin Chon (Eric Yorkie)    www.twitter.com/justinchon

Christian Serratos (Angela Webber) www.twitter.com/cserratos

Billy Burke (Charlie Swan) www.twitter.com/billy_burke

Gil Birmingham (Billy Black) www.twitter.com/gilbirmingham

Kiowa Gordon (Embry Call) www.twitter.com/circakigordon

Jaime Campbell Bower (Caius) www.twitter.com/jaimebower

Michael Sheen (Aro) www.twitter.com/michaelsheen

Charlie Bewley (Demetri www.twitter.com/alchemission

Cameron Bright (Alec) www.twitter.com/cambright

Edi Gathegi (Laurent) www.twitter.com/iamedigathegi

Rachelle Lefevre (Former Victoria) www.twitter.com/rachellelefevre