Boomarking feature table

Service name	Friends	Groups	Tags	Comments	Multimedia	RSS feeds	Other
Delicious	✓		✓			✓	(1)
Twine	✓		✓	✓	✓	✓	(2)
Diigo	✓	✓	✓			✓	(3)
Connotea		✓	✓			✓	(4)
CiteULike		✓	✓	✓		✓	(5)
Zigtag	✓	✓	✓	✓		✓	(6)
Simpy		✓	✓			✓	(7)
Spurl						✓	(8)
StumbleUpon	✓	✓	✓	✓	✓	✓	(9)

Definitions of features:

Friends

Capability for two users of the service to “connect” to each other for purposes of sharing personal information.

Groups

Capability for service users to create named “groups” of users (who are not necessarily “friends”). A group usually has dedicated space for comments, discussions, and other kinds of information not shared with non-members. Membership may be either open or subject to approval.

Tags

A “tag” is a label that can be associated with bookmarks (and possiblity other things). It describes some attribute of the object. Tags are sometimes restricted to single words, but better implementations allow multi-word phrases.

Comments

Bookmarks are assumed to have (optional) brief descriptive text associated with them. “Comments” are an additional feature by which any user who has access to the bookmark can add further information about either the bookmark or other comments.

Multimedia

A bookmark may optionally be associated with relevant multimedia content, such as images, screen captures, sound files, videos, etc.

RSS feeds

Capability to associate an RSS feed with a list of bookmarks. The lists may represent bookmarks of one user, comments on a bookmark, bookmarks with specific tags, bookmarks of a group, etc. The more options the better.

Notes:

1. Additional Delicious features: Tags can be grouped into related “bundles”; good RSS support for tags. Negatives: tags are single-word only

2. Additional Twine features: A “twine” is a group of related bookmarks that can be private or shared; other users can add to and comment on public twines; “semantic web” features; no export, can import from several services and formats

3. Additional Diigo features: rich social structure (“communities” for specific sites or tags); watch lists (for new bookmarks for specific sites or tags, or from specific users); import/export several services and formats

4. Additional Connotea features: rich bookmark descriptions; wiki for user info (“community pages”) and general discussion; ability to place content widgets on other sites; import/export many formats (no services)

5. Additional CiteULike features: user blogs; ability to store PDF files; “watchlists” for topics of interest; related links can be associated with bookmarks; rich bookmark descriptions. Negatives: tags are single-word only

6. Additional Zigtag features: has “semantic search” for bookmarks; allows for user discussion of tag meaning; import/export capabilities for bookmarks; “semantic web” features

7. Additional Simpy features: ability to import from browser and Delicious; watch lists; ability to select groups to share tags with

8. Additional Spurl features: import/export HTML format; uses hierarchical folder structure instead of tags

9. Additional Stumbleupon features: users can vote up/down on bookmarked items. Negatives: RSS feeds are limited (no tags).

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