First, create a Twitter collection within SearchBlox. This collection is only available starting with version 8.0.
Sign up to create an application at https://apps.twitter.com, and ensure you have the following values for the Twitter application:
Access token secret
Enter the values listed above in the appropriate fields on the Twitter collection settings page.
Then, select the Stream Type Filter, and enter the values for Filter Follow using the numeric ID of the Twitter handle you wish to index (you may enter more than one ID).
For example, if you enter
Filter Follow: 759251,19701628
this will index all tweets from CNN and BBC.
To look up any Twitter user's numeric ID, go to http://www.idfromuser.com and enter the Twitter handle.
See below for an input sample for a Twitter collection: