Mathilda May on Instagram and Twitter
If you can bare (no pun intended) it, her accounts are primarily in French:
https://www.instagram.com/maymathilda/?hl=en
Compte officiel
Auteure, metteur en scène, comédienne
www.theatremarigny.fr
https://twitter.com/MathildaMayOff
And here is an unofficial Facebook fan group:
https://www.facebook.com/groups/58967865719