The new update to version 1.3.4 of MyCurator will restore the capability to capture content from Twitter.
Twitter has moved to a new form of access to their content. All access must come from a Twitter user, and must come through a Twitter App if you are not logged in to their site. To use MyCurator to search Twitter for content, you must set up a Twitter App. Once you have created a Twitter App, you just copy a couple of keys to the Twitter Tab in the MyCurator Options menu. The Twitter API documentation walks you through this process, with screenshots for reference.