Norton Safe Web

When I'm on Twitter and click on anyone's profile pic, I get the below. What does this mean? Is anyone else having this issue? It's happening on 3 diferrent PCs.

 

Full scan, Malware Bytes, Trojanhunter scans all run.

 

Well, I can't attache a screen print, but it says Malicious website blocked. With the path where all the Twitter images are saved.