Scrolling changes the URL. This is bad because then the browser history gets filled with the website multiple times, and trying to return to the previous page is very cumbersome.
If someone’s image doesn’t load, then it’s blank and you can’t see that there’s someone there. There should be some default picture. You’re not hosting the image, so it could be unable to load if the host moves or removes the image, or if the user uses some kind of tracking protection (e.g. Firefox blocks many Twitter images).
Technical feedback on the website:
Scrolling changes the URL. This is bad because then the browser history gets filled with the website multiple times, and trying to return to the previous page is very cumbersome.
If someone’s image doesn’t load, then it’s blank and you can’t see that there’s someone there. There should be some default picture. You’re not hosting the image, so it could be unable to load if the host moves or removes the image, or if the user uses some kind of tracking protection (e.g. Firefox blocks many Twitter images).