Additional metadata - a tweet could attach to a specific URL, which the URL owner could reject if needed.  So, I could build a post form on my site to submit a tweet that shows as a comment, or you could use the API to attach a comment to my page, and I could accept or reject them as desired.  Perhaps even have different rules for tweets posted from my form than from the API, etc.<p>Tweets don&#x27;t have to be limited to 140 characters. I believe Twitter has kicked around the idea of longer ones.  I&#x27;d personally be in favor of upping to 200-256 and then even allowing a paid tier (either monthly or per tweet) to go to longer lengths, attach more media, etc.