Facebook question: How can I create an ad targeted at people interested in myalgic encephalomyelitis or Chronic fatigue syndrome? I was previously able to use the following headings: Alternative names for chronic fatigue syndrome, cfs or Chronic fatigue syndrome awareness. However they no longer work. I did post a question in the help section but they seem to be designed for other users to answer and I got no response. A Facebook employee lets me use some of her free credit. A lot of what I've used it for is to highlight appeals for research participants.