Here is a list of all the Elm Street alumni I could find on Twitter. This is definitely a work in progress because I couldn't find many. I'll update it over time, but if you have any I am missing please leave them in the comments section below.
Original Franchise
Wes Craven
Johnny Depp (Glen Lantz)
*John Saxon
Elm Street 2010
Jackie Earle Haley (Freddy Krueger)
Kyle Gallner (Quintin)
Thomas Dekker (Jesse)
Kellan Lutz (Dean)
Brad Fuller (Producer of Elm Street 2010)
Other
Elm Street Legacy
*Michael Berryman (The Hills Have Eyes)
Complete List of Horror Twitters or Tweet Soup / Horror.
*Not confirmed as official Twitter
We could probably add Facebook to this. Post them if you have them!