Saturday Discussion - Is Twitter losing it's business value?

I don't know if you're a member of the Problogger Forum, but there was an interesting thread there where a lot of people were suggesting that Twitter's value to those of us earning an online living has diminished in recent months.

Basically, the thread revolves around the statement that click through rates on links have dropped dramatically, to the point that some are saying it's no longer worth investing time on Twitter, at least from a business perspective.

What are your thoughts?

Have you seen a drop?

Have you changed, or are you thinking about changing the way you use Twitter?

If so, where are you reinvesting that effort?