Designed for the frequent traveler, Dopplr lets me share where i plan to go. Though it can share trips via Yahoo FireEagle, unlike Plazes and BrightKite, it dedicates itself to planned trips, not current location. It can use oAuth to discover friends on popular social networking sites without asking for passwords from those sites.

BrightKite lets me share where i am. Less mature than Plazes and Dopplr, so far it cannot yet mark past nor future trips. It vary precision when sharing presences with friends or contacts. Though it can share via Twitter and geopresence distributor Yahoo FireEagle, it cannot yet share via iCalendar.

Plazes lets me share where i go. Simple desktop and mobile apps let me check-in and place myself automatically using network identifiers recorded into its databases. Plazes also lets me tag and mark when and where i plan to go and have already gone, and share with friends or the public and also via a Facebook app, iCalendar, and geopresence distributors such as http://FireEagle.yahoo.net.

Twine empowers collaborative sharing and search using the Semantic Web to uncover and tie together concepts and deeper-than-textual relationships in Web pages.

Unlike most linkmarking and social media sites, to bar spam at Mahalo, humans read and approve every link and story submission.

Plaxo began as online address book and then calendar exchange, a way to maintain updates by letting users maintain their own profile and chose with whom they share it. This year Plaxo began offering lifestreaming, Pulse, aggregating comments from friends and affinity groups. It also maintains detailed profiles with distinct views for personal and professional lives, and shares them only within categories of contacts.

Designed for installation on blogs, Disqus becomes the comment system. It organizes comments around not only the blog, but also the comment and commentary, almost akin to lifestreaming services such as Jaiku and FriendFeed. Unlike lifestreams with comments, Disqus doesn't fracture the commentary; it is the commentary—the one designated by the author.

Unlike most lifestreaming services, LinkRiver not only aggregates my feeds for resyndication, but also aggregates all those i follow here. This yields a link view of items i find or might find of import.

A commented and tagged linksblog with reference counting, Shared Stuff also shares my Google Reader profile. Like Faves, it can also share via e mail, though of course, responding requires a Google login.

As typical for Google now, online web applications they build rise quickly to become category killers. Though NetNewWire and FeedDemon, both from Newsgator, still work better and also together, and claim top industry awards, Google Reader beats all other feed readers. Tagging and sharing what i read with aggregators such as FriendFeed, Plaxo Pulse, 43 People, Jaiku, Tumblr, 30 Boxes, even for resyndicating into Facebook, Tribe, and other social networking sites with personal profiles has never been easier.

Facebook became what others could have become, a rich platform and network for modular appliances—small focused applications. Facebook, however, adopts the walled garden approach, akin to Myspace, and works poorly with open architectures and protocols. Those not in verified college, workplace, and organization networks are limited to one regional geographical network.

A tumble log of ideas, inventions, and information on social enterprise, social capital, social computing, social media, collaborative filtering, calendaring, folksonomies, linkmarking, journalism, computer supported collaborative work, software and development, programming, photography, and other observations.

Run by a Finnish company in accord with European privacy law and standards, Jaiku aggregates feeds for others to discover and can channel them into short messaging service and text notifications. It also features groups.

Whether some stories truly need condensing editing to 1000 characters, or suffer it tolerably, Clipmarks can excerpt and share only that, though it allows another 1000 for commentary and numerous additional pictures, each worth maybe a thousand words. In addition to viral appeal in way of a Facebook app, the new Clipcast interface looks and works like a widget, perhaps to target mobile users. For this category, a thousand character summary of a page would then seem ideal! Linkmarking, indexed from terse to featureful, might go Reddit, Del.icio.us, Digg, Google, Yahoo, MyWeb, Clipmarks, Ma.gnolia, Faves (Blue Dot), Tumblr, and Google Reader Shared items.

An amazingly expressive collaborative calendar, in Eventful events can include sub-events and related events in sophisticated relationships. It distinguishes between calendars and groups—which have members and discussions. It also supports microformats, syndication, to feed calendars, feed readers, other applications and browsers.

A rich and expressive collaborative calendar now integrated with Yahoo for easier logins and also as a Facebook application, Upcoming reaches out to your friends to share events. It also automatically incorporates tagged photos from Flickr, and offers both Yahoo and Google custom roadmaps. For events already affixed in time and place, a collaborative calendar beats round robins of mail.