text: Yes! But just to very clear, you would write a message that reads like a petition advocating 1500 characters, and you end by inviting readers to click the "like" star as their way of supporting your proposal. You might even add, that CC would then have a complete list of the names on those "signing" the petition, although we only see the latest crop. 
  
  And, you COULD also created a continuation "reply to self" inviting those who disagree, who want the 1000 character limit to be retained, to click that message's "like" star.
  
  And, to get maximum exposure, you might try and be one of the first on a story with this petition-comment. 
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  And to follow your change of topic, I want to reply obliquely. In my town, there is an important Jesuit retreat centre, catering to an international crowd. Rather remarkably, among lay folk in town, there appears to be a much greater local interest in Ignatian prayer in Protestants congregations than Catholics parishes, even a Jesuit parish.