There are probably far more GC women on facebook than twitter, which has a tiny number of users compared to facebook, but ...
Unless you are on facebook it wont be immediately easy to find individual women.
However, many groups such as WPUK, Sex Matters etc., are all on facebook and they all have followers.
So without inappropriately hijacking a thread on their pages, you could easily add a post saying this is also a matter of concern / indication of police targetting GC women or whatever seems a good way to include the info.
Have you thought to share with Fair Cop who I think is both on twitter and facebook?