steemitimages.com resolves to two different Amazon IP addresses - they're having trouble with the S3 service at the moment (file storage, often including web site images), so it's probably down due to that.
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From https://status.aws.amazon.com/:
Increased Error Rates
We're continuing to work to remediate the availability issues for Amazon S3 in US-EAST-1. AWS services and customer applications depending on S3 will continue to experience high error rates as we are actively working to remediate the errors in Amazon S3.
Thanks for to bring some light :)