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.

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, can work together, and claim top industry awards, Google Reader beats all other online feed readers. Tagging and sharing what i read into lifestreams such as FriendFeed, Plaxo Pulse, 43 People, Jaiku, Tumblr, 30 Boxes, even for resyndicating into Facebook, Tribe, and other social networking sites 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. The Tumblr tunbleblogging platform now powers Ideavine.

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.

Oriented towards news and journalism, Newsvine features originals stories and linkmarks to stories. As a cofounder with Wired Magazine and the New York University School of Journalism, it also participates in Assignment Zero, a crowdsourced journalism experiment.

A multiformat document repository and archive with referral tracking and public, open logging, Scribd embeds a FlashPaper reader to display documents of many types right in the browser. It also includes social networking and collaborative story ranking.

An advanced photo sharing service supporting only Open ID logins, Zooomr features photostreams, favorites, portals, geocoding, and smart sets, and offers unlimited uploads in a flexible variety of formats. Still in beta, as Zooomr unviels Mark III, i will probably shift my intended use for it to host stock collections.

An amazingly full-featured and flexible photo sharing site, Flickr has become the buzz for photography on the Web. It boasts one of the most interesting collaborative filters for photography, http://flickr.com/explore/interesting/7days/ —be sure to see it. My stream includes selected works linking elsewhere.

Like Wikipedia, the Rochester wiki invites everyone to contribute. It has quickly become one of Rochester's top sites, though not without adverse effects. Trolls abound. Editors have no clue about libel. Egotism run rampant—so much against the grain of wikis. My page tallies my edits and contributions.

A Semantic Web innovator, this flexible and powerful linkmarking platform accepts only OpenID and Sxip Identity 2.0 logins. Groups can host discussions distinct from linkmark entries. It also publishes hFolk and hReview microformats. Its tags feeds my Claim ID sidebar tagroll.

A most powerful and flexible linkmarking platform, and unlike others, Faves (formerly Blue Dot) requires no registration. For minimal functionality, it saves user identity in a browser cookie and invitation identities in a coded link sent via mail, so recipients need not register to reply. The coded link also establishes a friend relationship with the recipient, should they also join. In addition, members can group friends, and share specific links only with those groups. It feeds my Tribe and Gaia summaries and other tumblelogs, and marks items i feel worthy of my readers.