Twitter is a social media platform launched in 2006 that allows users to post and interact using short 280-character messages known as "tweets". It grew rapidly after launch and by 2009 had over 7 million users. Some key features and services emerged around Twitter like third-party clients and apps that made it easier to access Twitter on different devices and share content and insights from tweets. The platform became popular for real-time news and commentary on various topics.

1. Twitter
Twitter
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@suzuinao @whynotnotice

5. Web

6. http://www.crunchbase.com/company/twitter

7. ‣
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9. Co-Founder Jack Dorsey
Creative Commons Photo by by Wikipedia

10. Twitter
Creative Commons Photo by by Wikipedia

11. Twitter 3
http://techgeist.net/2009/06/twitter-history-a-crazy-3-years/

12. Twitter 3
http://techgeist.net/2009/06/twitter-history-a-crazy-3-years/

13. http://techgeist.net/2009/06/twitter-history-a-crazy-3-years/

14. http://techgeist.net/2009/06/twitter-history-a-crazy-3-years/

16. 2009 3 1 31 CGM

17. http://bit.ly/15jx1I

18. http://bit.ly/XS6vS

20. Twitterverse
Creative Commons Photo by by b_d_solis

21. Twitter Logos
Creative Commons Photo by by Mimages DR

22. My Twitter Social Ego Networks
Creative Commons Photo by by Mimages DR

23. TweetWheel
http://www.tweetwheel.com/

25. Tweetie

26. Firefox add-on TwitterFox

27. TweetDeck

28. Tweetie for
iPhone

29. Tweetie for
iPhone

30. Movatwitter
Photo via Going My Way by @kengo
Creative Commons Photo by by Cocoarmani

31. Twitter4Skype

33. http://twittascope.com/

34. http://playspymaster.com/

35. http://twitpic.com

37. http://www.wefollow.com/

38. http://favotter.matope.com

39. http://twistori.com/

40. http://twitrratr.com/

41. http://eco.tter.jp

42. http://twittearth.com/

43. http://twittervision.com/maps/show_3d

44. http://www.wefeelfine.org/

45. http://vimeo.com/4587178

46. http://www.flixpulse.com/

47. http://alternativedesign.jp/tag/ar /

48. http://hashtags.org/

49. http://flowingdata.com/2008/03/12/17-ways-to-visualize-the-twitter-universe/

52. http://twestival.com/

53. http://summerofsocialgood.com/

54. http://twit4good.com/

55. http://twollars.com/

56. http://twittervotereport.com/

57. http://www.socialactions.com/labs/twitter-action-pack

58. http://wefollow.com/twitter/sustainability

59. http://wefollow.com/twitter/sustainability

60. http://wefollow.com/twitter/sustainability

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72. http://hashtags.org/