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Free app that allows you to post time-limited tweets.

WhoTweetedMe.com will analyze a URL and show you its most influential retweeters, potential reach and timeline. Due to Twitter API limitations, It works best on blog post URLs that are between 1 day and 2 weeks old.

Companies like Google and Twitter have taught us that a simplistic front-end and limited features can effectively have much more appeal to users ...

To include more, we'll limit each one to the Twitter capacity of 140 characters. We're looking for insights on how social media has changed business, media, technology, life, not necessarily in that order. Anyone who wants can either leave 140-character comments here, or Twitter them addressed to @stevebaker

If posting on a traditional long-form blog feels too ponderous and sporadic for you, Twitter may be more your speed: it limits your micro-blogposts to just 140 characters, and you can post your dispatches from your iPhone, BlackBerry or any other mobile device capable of text-messaging on-the-go.

Jesse at Socialtoo discusses implications of Twitter's recent announcement to cap access to the API for whitelist services. Comments are illuminating.

Regardless of the anger in the community, which clearly has been discounted as a small minority in Twitter's game plan, the clarity of Twitter's rate limiting and brute force approach in managing its developer community now stand in sharp contrast to FriendFeed's approach.

"Because social-networking tools are forums for personalized, socially focused conversations, the communities that spring from these tools are person/people-centered. As Porter explained, this person/people-centeredness results in the value of participation being opaque for anyone who is not participating. To address this problem, we made sure that students who chose not to participate (because the value of participation is opaque for them) had access to our tweets by incorporating an RSS feed-like Twitter widget in our LMS. (See Figure 5.) Many widgets like these can be found online, although we should note that this particular widget has limitations. As seen in the example in Figure 5, the widget only displays Joni's posts, not the back-and-forth exchanges between her and members of her network. Students might incorrectly assume that the interaction is one-sided and less than dynamic. Besides keeping students apprised of the resources we shared via Twitter, however, this widget allowed them to vicariously discover Twitter's value. Some students later chose to join us in Twitter because they had a better understanding of what they were getting into because its value was less opaque. Ultimately, we found that Twitter helped us achieve our student-engagement objective, but we also quickly discovered that students' Twitter participation led to other notable instructional outcomes."

Twitter has started doing Testing of Local Trends (i-e Location-based Trending Topics) with some limited number (1 percent) of Twitter Accounts.

WhoTweetedMe.com will analyze a URL and show you its most influential retweeters, potential reach and timeline. Due to Twitter API limitations, It works best on blog post URLs that are between 1 day and 2 weeks old.

Typically, when you schedule something - at least something happening in the immediate future - you don't spell out the date and time, but rather say something along the lines of "let's have lunch on Friday at noon." And that's where Task.fm looks to differentiate itself in the crowded market for reminder services. The service takes a Twitter-like approach to getting reminder data from you, with a 140-character limited form that wants you to input the answer to "remind me about …" Input things like "Mashable event Thursday at 6pm," "flight tomorrow at 8am," or "basketball next Monday at 7pm," and Task.fm figures out the date and adds it to your reminder lists.

Pour le réseau social, l'enjeu est clair : encourager les utilisateurs à partager leurs messages avec le monde plutôt que de se limiter à leur cercle restreint d'amis.