Free Social Media Search Tools
Provides a search engine for conversations on Twitter. One nice feature allows you to see all conversations linking back to a particular website.
Real-time search engine for status updates on Twitter.
Google Blog Search
Search millions of blog entries and filter results by date, URL, author and language.
Alterian SM2 - Free Edition
Allows you to track conversations, review positive/negative sentiment for your brand, clients, competitors and partners across social media channels such as blogs, wikis, micro-blogs, social networks, video/photo sharing sites and real-time alerts.
A personal browser for tracking Twitter and Facebook posts. Provides a search tool for finding Twitter lists based on keywords.
Provides a power ranking of any Twitter profile entered along with statistics such as number of followers, number following, and total updates.