Visualforce page and controller for surfacing an RSS feed of Questions from Salesforce.

QandARSS

<apex:page controller="PUBQandARSSController" contentType="text/xml" showHeader="false" sidebar="false" cache="false"><?xml version="1.0" encoding="UTF-8"?>
    <rss version="2.0">
        <channel>
            <title>Power of Us Hub Questions Feed</title>
            <description>These are the 50 most recently asked questions on the Power of Us Hub</description>
            <link>http://powerofus.salesforcefoundation.org</link>
            <apex:repeat value="{!questions}" var="q">
                <item>
                    <title>{!q.title}</title>
                    <description>{!q.description}</description>
                    <user>{!q.creator}</user>
                    <link>{!q.link}</link>
                </item>      
            </apex:repeat>
        </channel>
    </rss>
</apex:page>

QandARSSController

public without sharing class PUBQandARSSController {
    
    public List<PUBQuestion> questions { get; private set; }
        
    public PUBQandARSSController() {
        this.questions = new List <PUBQuestion>();
        
        List <Question> questionlist = [SELECT Id, Title, CreatorName, Body FROM Question ORDER BY CreatedDate DESC LIMIT 50];

        for (Question singleQuestion : questionlist) {
            questions.add(new PUBQuestion(singleQuestion.Title, singleQuestion.Body, singleQuestion.CreatorName, 'https://powerofus.force.com/_ui/chatter/service/ChatterAnswersUi#!/feedtype=SINGLE_QUESTION_DETAIL&id=' + singleQuestion.Id));
        }
    }

    public class PUBQuestion {
        public String title { get; private set; }
        public String description { get; private set; }
        public String creator { get; private set; }
        public String link { get; private set; }
           
        public PUBQuestion(String title, String description, String creator, String link) {
            this.title = title != null ? title.escapeXml() : null;
            this.description = description != null ? description.escapeXml() : null;
            this.creator = creator != null ? creator.escapeXml(): null;
            this.link = link != null ? link.escapeXml(): null;
        }
    }

    /****************************************
    *  			TESTS					*
    ****************************************/

    static testMethod void testFeed() {
    	
    	List<Question> sampleQuestions = new List<Question>();

    	Community c = [SELECT id FROM Community WHERE IsActive = true LIMIT 1];

    	for (integer i = 0;i < 50; i++) {
    		Question q = new Question(
    			Title='Why would anyone use the 1-to-1 model?',
    			Body='I\'m confounded',
    			CommunityId = c.id
    			);
    		sampleQuestions.add(q);
    	}

    	insert sampleQuestions;

    	PUBQandARSSController controller = new PUBQandARSSController();
    	system.assertEquals(50,controller.questions.size());
    }
}