Social Mention is a social media search engine that searches user-generated content such as blogs, comments, bookmarks, events, news, videos, and microblogging services.
Twitalyzer is Twitter's most popular measurement solution for business and personal users, focusing on influence, impact, engagement, generosity, and nearly 30 more measures of success in Twitter.
HootSuite - Social Media Dashboard. With HootSuite, you can monitor keywords, manage multiple Twitter, Facebook, LinkedIn, Foursquare, Ping.fm and WordPress profiles, schedule messages, and measure your success.
Find Twitter celebrities, actors, TV personalities, or new Twitter friends in your area. WeFollow is a directory of Twitter users organized by interests. Find likeminded friends today!