レス5ではないけど、SNSでの発言が全体の数%と言うのはいまや常識です。
Social Listening とかsocial Media analytics で検索してみてね。大学のDigital marketingで習う基本中の基本だから、ソース出せと煽ってる人って世の中についていけてないお年寄りかお勉強できない人なのかな。
The 90-9-1 Rule for Participation Inequality in Social Media and Online Communities
Summary: In most online communities, 90% of users are lurkers who never contribute, 9% of users contribute a little, and 1% of users account for almost all the action.
上の記事読んだ?結構面白いね。
1% of users participate a lot and account for most contributions: it can seem as if they don't have lives because they often post just minutes after whatever event they're commenting on occurs.
だって。ここでも良く見かけるやつね。