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itzle

Link: itzle. Currently in closed beta. itzling a website allows you to converse with anyone else currently itzling the same location.

Riffs: Your Social Recommender

Link: Riffs: Your Social Recommender Similar to Del.icio.us and Digg

StumbleUpon Reviews

Link: StumbleUpon Reviews. It lets you search, browse, review and share great sites

Conversate

Link: Conversate lets you create instant online discussion spaces. It's simpler, faster, more polite, and less annoying than group emails.