Site edits/TLs CANNOT be made by anonymous. Anonymous is ONLY for Blogging, Spotting & Trips. As for abuse, there are actual members behind anonymous posts - who are equally subject to GN/SW, if they violate Forum Guidelines or are seen to be trolling.
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"Anonymous" post members will be especially careful, since if they receive a valid SW, they will have to respond to clear it up. And there is no "anonymous" option for GN/SW replies - the members name will be known.
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On the whole, it is expected to be an option for long-time members who may want to express a certain opinion/argument that they are unwilling to associate with their original ID. Also, with the introduction of this feature, we shall be able to sternly clear away duplicate IDs.
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Thanks.