as root:
# screen -dmS top top
# ls -ls /var/run/screen/S-root/
#

as user:
% screen -dmS zsh /bin/zsh
% ls -ls /var/run/screen/S-user/
4557.zsh
%

Started from scripts (mainly starting lxc-containers as root) none of the 
lxc-containers bound to screen have a socket I could connect to. Sending
"killall -CHLD screen" makes the sockets appear. Afterwards it is possible to 
connect the socket in question, accessing the lxc-container console.

Screen reports itself being version:
Screen version 4.00.03jw4 (FAU) 2-May-06

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https://bugs.launchpad.net/bugs/694732

Title:
  screen does not create socket if started with options -dm

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