大数据在社交媒体领域的应用有哪些？请举例说明。

import java.util.HashMap;
import java.util.Map;
public class SocialMediaMarketing {
    private Map<String, Integer> userLikes;
    private Map<String, Integer> userComments;
    public SocialMediaMarketing() {
        userLikes = new HashMap<>();
        userComments = new HashMap<>();
    }
    /**
     * 记录用户点赞行为
     * @param userId 用户ID
     */
    public void recordUserLike(String userId) {
        if (userLikes.containsKey(userId)) {
            int likes = userLikes.get(userId);
            userLikes.put(userId, likes + 1);
        } else {
            userLikes.put(userId, 1);
        }
    }
    /**
     * 记录用户评论行为
     * @param userId 用户ID
     */
    public void recordUserComment(String userId) {
        if (userComments.containsKey(userId)) {
            int comments = userComments.get(userId);
            userComments.put(userId, comments + 1);
        } else {
            userComments.put(userId, 1);
        }
    }
    /**
     * 获取用户的点赞数
     * @param userId 用户ID
     * @return 点赞数
     */
    public int getUserLikes(String userId) {
        return userLikes.getOrDefault(userId, 0);
    }
    /**
     * 获取用户的评论数
     * @param userId 用户ID
     * @return 评论数
     */
    public int getUserComments(String userId) {
        return userComments.getOrDefault(userId, 0);
    }
    public static void main(String[] args) {
        SocialMediaMarketing marketing = new SocialMediaMarketing();
        marketing.recordUserLike("user1");
        marketing.recordUserLike("user1");
        marketing.recordUserComment("user1");
        int likes1 = marketing.getUserLikes("user1");
        int comments1 = marketing.getUserComments("user1");
        System.out.println("User1 likes: " + likes1);
        System.out.println("User1 comments: " + comments1);
    }
}