We experienced a brief hiccup in post submissions but are nearly back to 100%.
A little over an hour ago, we received a report that posting was broken -- we have found a workaround and are narrowing down the cause. It's looking like it may be due to recent change to one of the plugins -- we've been moving fast on the bleeding edge to keep up with growth and features, and a bug has caught up to us.
We apologize for this service interruption! Steemit.com is almost fully recovered and this post will be updated with any further details.