they are encouraging all ems to use facebook for events, they hope to get new people interested in the game through social networking
No they aren't. Certain EM's have made Facebook pages, some haven't. Some post on Stratics, some don't. Bennu has said over and over for the past couple weeks, that Atlantic would be primarily using Facebook from now on.
Atlantic had the event posted on Criers, Facebook, and updated the site earlier today. It was also sent out via twitter.
All the EMs have been very adamant that whether they post on Stratics or use Facebook is purely a personal decision, and not something mandated by Mesanna or Broadsword.