"Are you concerned that someone you know is becoming an extremist?" one message reads.
"We care about preventing extremism on Facebook. Others in your situation have received confidential support."
The message also provides a button to "Get Support," which leads to another Facebook page about extremism.
Redstate editor Kira Davis, who said was sent a screenshot of the message from a friend, wrote: "Hey has anyone had this message pop up on their FB? My friend (who is not an ideologue but hosts lots of competing chatter) got this message twice. He's very disturbed."
And others reported getting a warning that they may have been "exposed to harmful extremist content recently." The message then states that "violent groups try to manipulate your anger and disappointment," similarly offering a "Get Support" option.