This is a fake story that fooled my friends and me:

"WARNING! People are going door-to-door handing out masks, saying it's a new initiative from local government. They ask you to put it on to see if it fits, but it has been doused with chemicals that knock you out. Then they rob you. Don't accept masks from strangers! "

Deleted tweet from my local source:
https://twitter.com/SFSAFE/status/1483887252384239622