I'd suggest "Posts should invite conversational, informal response" as she could claim she is inviting a response (The desired one being, presumably, "Yes! We will rise up and fight injustice with you!") . If she feels she has to make such posts, would encouraging her to talk about past things she has done - in a conversational and interesting way - be a way of heading her off. You could try to persuade her that if she shows people it's possible to have a good time (at rallies, soup kitchens, etc) and that it's not just joyless dutiful do-gooding she might actually be able to recruit people.