Techrigy SM2
SM2 is a software solution designed specifically for PR and Marketing Agencies to monitor and measure social media. As businesses and consumers increasingly utilize and rely on social media, your agency needs the best tools and expertise to stay competitive.

Features:
SM2 searches an expansive collection of social media. Over 100 million blogs, Twitter, YouTube, Flickr and Wikipedia are all monitored. These media are indexed in real-time, and SM2 provides instant alerts if certain discussions are found.
Pros:
Heavy data aggregation across entire social sphere. Provides insignt on multiple levels of sentiment. Plenty of charts and graphs.
Cons:
Maybe too data-heavy, depending on user. SPAM often evades filters.
Pricing:
Free for 1,000 results, $500 – $2,000/month depending on need