Did you know you can display tweets from Twitter in a Moodle Block using Twitter's official Widget tool? It is possible to display tweets from a single account, from multiple accounts, your own favourite tweets or tweets based on a search such as a hashtag. You will need a Twitter account to create the Widget.
Have a look at my moodle course on research skills
http://learn.nmmu.ac.za/course/view.php?id=1413