Why do you require a Twitter account to be entered in order to upload my profile

I wanted to review and update my profile information, but I see that a Twitter account is required. Why? I haven't had one in ages and I don't plan on opening one in the future.

Hi Riccardo

What's the twitter account you are talking about? We do not require Twitter account, so I do not understand the issue you are having. Could you please make a screenshot showing us where the Twitter account is required so that I can check ?

Tuan

After editing the field and clicking the Save button at the bottom, I get kicked out and go back to the first tab with this message. I've tried it with all three major browsers (always with the cache cleared), but the problem persists.