We know about plugins which provide peer code review (trac-hacks.org/wiki/PeerReviewPlugin), agile (trac-hacks.org/wiki/AgiloForScrumPlugin)
But I was trying to find a twitter like plugin on Trac where people can put their own updates J found some below (useful)
http://trac-hacks.org/wiki/NewsFlashMacro - Somewhere daily scrum /meeting highlights can go.
http://trac-hacks.org/wiki/VotePlugin - Could vote for tickets / milestone.
http://trac-hacks.org/wiki/AnnouncerPlugin - Users can subscribe for modifications on other tickets.
http://trac-hacks.org/wiki/StractisticsPlugin - Shows Trac/SVN updates statistics.
http://willbarton.com/code/tracgantt/ - Gantt chart generator.
http://trac.edgewall.org/wiki/CruiseControl - Trac plugin from which we can access continuous build process (you may also want to explore http://bitten.edgewall.org/).
http://trac-hacks.org/wiki/TicketChartsMacro - Ticket stats in Bar, Pie, Stacked charts.
And
