Despite all to the contrary it depends on how you use it.

If you decide to join twitter, a great site to book mark is www.Twitscoop.com
This is to pick up a few tips on how you can choose your words and have them eating out of your hand.
Finding out whats popular!

You can use twitter as a social tool like Butterfly Marketing to “Attract People” to your blog with a Butterfly Effect. Just don’t spam. Leave good content and it will create interest in your profile in which for example you could put: Thanks for following me . I would love if you could follow me on: Warning! 7 biggest blogging mistakes you don’t want to make. 

Presumably you’ve chosen your twitter friends carefully so that they are those who are interest in the subject which your blog represent.
Don’t waste your time talking about internet marketing if the twitter is about Obama and expect to get much of a positive response

Well with this being said , I hope you get the opportunity to use Twitter as it is really becoming a tool of the future for Blogging Marketing.