I found this fascinating quote today:
I wouldn’t encourage the naysayers to start chanting “the wicked witch is dead” just yet, but there has been a definite decline in Twitter users. According to the latest research from eMarketer, Twitter posted a decline in users from 23 million to 20 million. How is this possible you ask? Easy. The honeymoon is over and the novelty is starting to wear off for this social media darling. I think this is a normal correction, but it will require some smart thinking from Twitter’s founders to survive this dip. One savvy step in the right direction is their recent deal with Google (and Bing) which allows “tweets” to be included in real-time search listings.startupnation.com, StartupNation Blogs, Jan 2010
You should read the whole article.