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Anytime you see something that you find questionable on the site flag it. If it's an avatar or something posted or linked in a user profile, flag one of the user's posts using a custom mod message explaining what you think the problem is. If the questionable content is in a question, answer, or comment; flag the content directly using​ a "rude or abusive" ...


7

No, it means that the user who upvoted your post had his account deleted. https://worldbuilding.stackexchange.com/help/user-was-removed


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The user's profile picture has been changed to a generic identicon avatar. In general, profile rules on Stack Exchange are pretty lax. Some things are allowed that would not be allowed in posts, comments, or in chat: Certain obscenities Self-promotion Some cases are really judgment calls, and there are of course completely unacceptable statements and ...


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