Twitter just few weeks back a new feature, which uses the status updates from your users and allows you to retweet them to your followers. You only see the retweets from the users you follow.
This is just another feature in Twitter's vast developments recently. Just to list some of the Twitter updates Twitter's New Interactive Dashboard, Twitter enrolls a new feature by grouping the users into user generated lists and You Can Display Your Twitter Updates On Your Linkedin Profile and Vice Versa
The images below explains the idea,
You may also want to check the top 13 ways to optimize your twitter profile
Comments