I registered for Twitter more than 3 years ago, but within a week after registration, I have stopped using it even in my first language. The reason was because I had to check overwhelming amount of updated posts every day and could not keep up with the speed of posting.
Two articles I have read for writing this post (1) "Can we use Twitter for educational activities?" and 2) "7 things you should know about microblogging") also discussed both advantages and disadvantages of micro-blogging. I would focus on bad points here; for example, microblogging might make students, especially who can access it via smartphones, addictive to the Internet. Since they do not know when new information arrives in their devices, they need to check their teacher’s micro-blog many times a day. It will not be an appropriate use of technology because the purpose of using technology in a classroom is to make them smart users of technology not technology ‘geeks.’
I guess it is difficult for micro-blogging to survive as an excellent learning tool in the future because it does not have many advantages when compared with facebook, Voice thread, or blogging, because micro-blogging originally aimed at communicating one’s thoughts or state to others privately not publicly such as social networking. Just like you might not want to read teachers hundreds of private tweets only for finding deadline for submitting an assignment. In this case, e-mail would be a better tool to send the message to students. Teachers should be careful for making proper use of the useful tools.
On the other hand, as for professional development, yes, you can meet many people online through micro-blogs who you could not have met otherwise. You can build your community and ask questions to your followers or other users there. This is a wonderful tool!!