Twitter embed glitches
For reasons I do not understand, if you have embedded a tweet, you must must MUST do two things, or the site may crash. This was the cause of the outage in the last hour, and nothing far worse, thank heavens!
1) Position the cursor after the embed code, and click the Break icon (A/B) on the toolbar icon.
2) Look for "Text Format" below the box where you are typing the post, and into which you pasted the Twitter embed code, and select Full HTML (use for tweets) from the dropdown.
Step 1 is needed to make sure the site doesn't break the Twitter embed code in the middle or something, which could confuse the browser.
Step 2 is needed so that (a) the Tweet formats as a tweet and (b) the site doesn't crash. I don't know why that is, but I've done it too, and I can make the crash go away by doing steps 1 and 2 in that order.