My cynical side wonders if Snowden's other recent tweets denouncing Assange's ongoing show trial are to blame.
That's because a tweet can be deleted by the owner of the tweet, and the embed won't show it in the article anymore. Embedding tweets in an article is usually bad practice, and it also slows down the page with unnecessary Javascript.
Frankly I see nothing wrong with just copying and pasting a Tweet, so now you have a verbatim copy of what was said. Then there is the issue of edited tweets which apparently are coming soon, giving another troll tool to users of Twitter.
The utter lack of linking in internet articles is terrible. I understand that it's like free advertisement sometimes but hell...you're already reporting and the traffic from your page would ENCOURAGE potential ad clients to run ads on your page if it generates so much traffic...