…not sure what services the Tagosphere actually searches in.
There are many social bookmark services to cover and a lot these days are becoming very specific eg. 43 things, flickr, Reader2, MOG, connotea, citeulike, youtube, etc (see more at supr.c.ilio.us)…and more.
…so maybe you could limit again to the type of bookmark service you would like to search in, or select services you don’t want in your search.
The general bookmark services that are essential:
A service that would search in all 12 of these engines at once would be a great human indexed web to challenge the current traditional search engines.
Not only has every page been chosen by users, but you have the bonus of searching by tag.
It won’t have the great coverage of traditional search engines but the quality is certainly less noisy, and the results can just the same be based on a PageRank type of relevancy, also weigh in the amount of times a URL has been bookmarked into the ranking score…and again there is the by product of searching by tag.
The basic difference is that sites in the index aren’t crawled, they are chosen by users…imagine Google searching in a user subset of the web (with frequency of bookmarks added to the PageRank method…as this is a vote for a webpage, similar to a citation reference).
[ADDED: I forgot to add other similar type bookmark services such as Digg, Reddit, Shoutwire, 180 news, and many more
…even if these don’t have tagging, they are still bookmarks, but many are utilised to spread current news more than for personal bookmarking, some are also not only news based but also subject based such as SpinSpy.
So there is some consideration to be made:
- general bookmark service
- subject based bookmark service
eg. 43 things
- document type bookmark service
eg. citeulike, youtube, reader2, etc…
- bookmark voting service
- subject based bookmark voting service
[ADDED: RSS Reader bookmarks, such as Rojo]