対策として，スパムフィルタもひとつの案ですが，
書き込み可能な相手の限定というのもひとつの案．
それだとコミュニケーション範囲が狭まるかもしれませんが，
その範囲を広げるような技術があれば丸く収まるかもしれません．
S/MIMEによるメールの暗号化～「Web of Trust」による無料のデジタルIDを試す
メタデータによる知人ネットワークの表現
これは別の話ですが信用を築くと言うことで．
Blogは個人が自分の信用を作るための舞台装置
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