Basic Requirements:
1) Has to know what pages people have tipped on.
2) Has to be able to create posts on said pages.
3) Has to be able to authenticate individuals (so one person cannot withdraw another person's Bitcoins).
How can we do this?
1) User submits URL of page to tipping bot after writing up a tip. The tipping bot forever stores that page and checks it in the future for more tips at regular intervals.
2) This is the biggest problem, and might require a lot of manual work for each new page submitted. I am thinking that the bot could store credentials for each domain managed, then attempt to use said credentials to log in whenever a new URL is submitted under that domain. If it fails, then whoever is managing the bot would be notified.
3) Authentication is another big challenge. Many login systems are unique in how they will act, and whether they will let users send private messages to each other. So, different rules will have to be created with each system. Disqus, for example, allows users to "leave a message" on another user's profile, but those are likely public. Still, allowing users to withdraw money publicly would still be better than nothing.
Bottom line is, it could most definitely work, but would require a lot of setup for each comments system that is used. It is good that news sites are trending towards using already-standardized platforms (like Disqus and OpenID), and may be incredibly easy to implement because of that. But there are more websites than just news site that people might want to tip on. Forums, for example, would be a big one. The user could certainly sign the bot up for numerous forums as needed, but the forum admin could always ban the bot and cause tipping to come to a standstill there.
Thoughts?
Just create a chrome and firefox plugin. Solved.