Imagine &quot;Enterprise Twitter&quot;, something like Yammer and Slack. I use Yammer at work and it is worse than Twitter in every way, except it has no post length limits and you can create groups. Without the annoyance of spammers, Enterprise Twitter could implement new features like following #hashtags. Twitter needs to fix their threading UI, though.<p>Facebook has a &quot;Facebook at Work&quot; enterprise product and, from what I hear, the company dogfoods its own platform for work as an alternative to email and mailing lists.