As part of its ongoing effort to reassure Twitter users that their tweets are actually being read, Twitter is rolling out in-browser notifications for visitors of Twitter.com. Over the next few weeks, logged-in users of the site will begin getting pings for replies, favorites, and retweets. You can also change your settings to receive notifications for direct messages and new followers. And the notifications are interactive, letting you reply, favorite, retweet, and follow from the notification itself. Facebook has long had in-browser notifications, of course, and Tumblr rolled them out last year. It's a proven method of getting users to spend more time using a social network — and given Twitter's difficulties attracting and retaining users, it's a move that was long overdue.