Some of the EMs do post. There is no requirement for an EM to use Stratics if they don't want to. Same with the devs (Kyronix & Bleak).
The incident you mention was not related to site security, but an argument between people that got out of hand.
All EM sites feed into their respective shard board, so long as the EM site allows for RSS feeds. I check them regularly to make sure the feeds still work. Also, it doesn't stop community members from posting links and such themselves.

We actually encourage that!
Sadly, Legends is one of the few shards that does not have an active EM site. I've tried to set up feeds from Facebook, but it doesn't work that way.
Best anyone from Legends can do, for those who don't want to go to Facebook, is to post info from there to Stratics?
Hmm... we would use a Shard Reporter for Legends... if anyone is interested, let me know.