The families of victims grieve near Sandy Hook Elementary School.
Police in Medicine Hat, in southern Alberta, said they started an investigation on Boxing Day into "disturbing and threatening comments" on a Facebook post.
Police did not elaborate on the content of the post other than to say it contained a threat against a local school and "disturbing" remarks about the shootings at Sandy Hook Elementary School, where 20 children and six adults were killed in a gunman's rampage on Dec. 14.
Police did not identify which school was the subject of the threat but said local school administrators have been advised of the investigation.
The man, whose name has not been released, is charged with making threats and pubishing obscene matter. He is expected to make a court appearance Monday.