My understanding is: Photographer published a photo on their own website. Tweeter posted it on Twitter. Twitter trimmed it, removing the credit line. Retweeter retweeted it. Photo was still trimmed. Photographer sued Retweeter for distributing their work without proper credit. An obvious question would be if Photographer asked them to delete the tweet(s) first, and why they chose to sue Retweeter not Tweeter. I'm gue…
* Photographer published a photo on their own website
* Tweeter posted it on Twitter, the credit line is preserved.
* Retweeter retweeted it. The photo thumbnail in the reweets are trimmed in the timeline. Tapping on the photo to view it in full, you can see the credit line.
* Photographer sued Retweeter for distributing their work without proper credit.