Twitter just announced that users can now create their own custom timelines. From the blog post announcement:
Custom timelines are an entirely new type of timeline –– one that you create. You name it, and choose the Tweets you want to add to it, either by hand or programmatically using the API (more on that below). This means that when the conversation around an event or topic takes off on Twitter, you have the opportunity to create a timeline that surfaces what you believe to be the most noteworthy, relevant Tweets. Each timeline is public and has its own page on twitter.com, making it easy to share so others can follow along in real time as you add more Tweets. And since custom timelines are part of our Twitter for Websites toolkit, you can embed these timelines on your website.
A few examples the announcement referenced included a timeline curated from popular tweets about The Voice and a Q&A by The Guardian on the NSA story. Certainly opens up brand activation around singular topics, and offers the opportunity to have engagements off of your dedicated account timeline.