Would requiring students to use Twitter as an integral part of a course potentially conflict with FERPA? I'm not planning on requiring my students to use Twitter, but it popped up on someone else's syllabus and got me thinking as to whether it's appropriate with respect to student privacy.  

I don't think it's right since Twitter allows public viewing of messages and their sender, exposing the enrollment of the course to the wider world and the CMS the professor uses has sufficiently similar technology baked in that's FERPA safe.

I'm curious if anyone else sees it differently.

Per comments, I should note that this is not just a marketing-type class.  The syllabus I saw intended to have students comment, converse, and critique work on-line.
To elaborate on @Danny Ruijters comment:

The acceptableness of using Twitter as a course requirement greatly depends on the course itself and how Twitter will be used. Courses which could easily integrate Twitter are business courses focusing on topics such as:


Marketing
SEO (Search Engine Optimization) 
SMO (Social Media Optimization)
SMM (Social Media Management)


If a course wanted to use Twitter as a form of communication (could be an argument to make with a business communications course depending on the syllabus) then there's no reason to use Twitter. I don't know a single school that doesn't have a student email system and more and more schools have online learning centers used by both virtual and ground (in class) courses. 

In a case where Twitter was acceptable students should NOT be forced to use their own personal accounts or even release the name of their personal account.