User avatar and extrafieds

[wbread]

Hi.
I want to make pre-avatars for users so that they can select them from the list, but if the picture is not loaded by the user he does not see them.
how to make that visible to all users installed avatars?

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so I added an extra field in the user profile for links to social networks, but the parser removes all slashes from there.
how can I fix it?