140h.me is a collaboration space for Twitter. You can use #hashtags to create hashtag-based pages on 140.me. Hashtag pages are collaborative and persistent and can be edited wiki-style.

Muecs - Mulaboration was built for enterprise to collaborate for groups, departments, or even with other company networks to create a private channel for collaboration. Mulaboration integrated social web site services to collect market intelligence by receiving and sending the message feeds and to search information from the social websites for data and information analysis.