(1) Twitter clients and services that allow users to manage multiple accounts, discover new people to follow, and track trends and topics on Twitter. (2) Tools for URL shortening, posting to multiple networks at once, and monitoring specific words or hashtags. (3) Navigation and organization tools like desktop clients, dashboards, and services that organize Twitter into threads, streams and lists. (4) Search and discovery services that find relevant tweets, users, videos and products based on search terms or what others are talking about.

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3. My Opinion
just like Twitter!
very cool graphs!
comprehensive
stats and graphs
cool
just like twitter.com