What's happening?
Even though the steem data is stored on blockchain, the images are stored on Amazon AWS. Today the media server is experiencing some technical issues and we have no images on steemit.com.
Are there any alternatives?
There some other apps like chainbb and busy.org, but they wouldn't help for this issue as the images aren't stored on blockchain.
How to solve?
For now we have to wait while Steemit Inc will solve the issues with their Amazon instances. However, it proves that steem is vulnerable to a ddos attack to those servers, which would make steemit partially unavailable since lots of posts rely on images included there.
UPDATE: The issue is solved, though the suggestion above is still actual.
Obviously, we need the images also be stored on the blockchain or just transform them into blobs and include in the post's body. If you agree, please upvote and resteem for reach.