You could query the live api: https://hacker-news.firebaseio.com/v0/updates.json?print=pretty https://hacker-news.firebaseio.com/v0/updates.json?print=pre...

You could query the live api: https://hacker-news.firebaseio.com/v0/updates.json?print=pretty https://hacker-news.firebaseio.com/v0/updates.json?print=pre... Do this periodically and you can have user activity stats