"Under the Criminal Code of Canada (Section 21), you can be charged as a "party" to an offence if you were involved in planning, "encouraging", or aiding in its commission" Criminal Code (R.S.C., 1985, c. C-46)

"21(1) Parties to Offence: Anyone who actually commits the offense, aids in committing it, or abets (encourages) someone in committing it is a party to the offense."

I work in a law firm but NAL. I could probably find some cases if I had time. Most of the responses from people saying defamation is not very successful and "good luck" in the us because of 1A seem strange to me also.