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It is fun to bookmark pages, and neat to share that information occasionally with other users.

From the dozens of Silicon Valley and other start-ups feverishly developing new technologies to let you do this, you’d think it is the latest Internet El Dorado. Precious little money is being made from any of these sites. They are almost all advertising based.

And yet investors keep backing them.

The latest is ActiveWeave, of San Francisco, which has been developing software to let users post notes, or stickis about a particular page and then share those notes with others.

It has received $600,000 in seed funding, and will be releasing its product this summer, according to VentureWire (sub req). If you find a Web site you are interested in, ActiveWeave provides a sticki, or little window, on it to see if anyone in your social group has commented on it. Apparently, it has a lot more up its sleeve. We’ll wait to see whether it is different from the other offerings — like Blue Dot and Searchles, which launched last week and provide a way to search your friends’ bookmarks. Searchles is reportedly about to integrate with another technology, Pligg, which lets people submit and then rate site content. Then there are the other related players — Diigo, Kaboodle, Jeteye, Onfolio, Plum, all either owned by large companies or backed by angels and/or venture capital.

Activeweave is backed by tech pundit Esther Dyson, among others.

Also new is that Seattle’s Blue Dot has gotten $1.5 million in angel backing, including from former Starbucks Senior VP Don Valencia and former Microsoft Senior VP Richard Fade, according to Marshall Kirkpatrick.