HootSuite

If you want to know the value of Twitter, sign up for HootSuite (www.hootsuite.com). Twitter in and of itself isn't useful to me, but HootSuite is. It allows someone like me to track emerging trends and competitors using keywords. For example, I use the words SaaS and Accounting and have found out about three players in the SaaS Accounting space that I was previously unaware of.

Yes, you can put these two words in Google and search away, but with HootSuite the results come to you.