Plot the site activity by voting, questions, answers and comments, aggregated per week.
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with Voting as ( select DATEADD(DAY, 0 - DATEPART(WEEKDAY, v.CreationDate), DateAdd(DAY, -1, v.CreationDate)) as YearMon, case when p.PostTypeId = 1 then 'Q' else 'A' end + vt.Name as Series, 1 as Vote from Posts p, Votes v, VoteTypes vt where p.Id = v.PostId and v.VoteTypeId = vt.Id ) select * from Voting pivot ( sum(Vote) for Series in ([QUpMod],[QDownMod],[QFavorite],[AUpMod],[ADownMod],[AAcceptedByOriginator])) as Pivoted where YearMon >= '2013-01-01' order by YearMon