“Twitter is testing a Facebook-like message wall on profile pages, prompting users to send public tweets (a.k.a @ replies, or mentions) to specific users directly from their profile pages.”
Read more: Mashable.com
When you visit someone else’s page, the “wall-box” displays an invite to tweet that person (“Tweet to @…”).
Once you click in the box the Twitter-handle is automatically inserted and you are ready to tweet!
What it looks like:
I am digging this new feature! About time…