I don't know if this is a known bug or not, but I have found the following weird behavior: if I go to "My friends" page and try to remove multiple users from the list, my access gets temporarily restricted by NGINX. After regaining access and looking at the network tab in chrome console, it seems that the number of requests for removing users consecutively grows exponentially (if I remove 4 users it will make 1 + 2 + 4 + 8 requests, and removing 5th user results in 16 identical requests). This can cause some frustrating experiences as after removing 10 users or so NGINX will restrict your access for quite some time. Can somebody from Codeforces staff look into this issue, please?