"I'm afraid it's not currently possible, because the 'All Activity' page (and also the home page) combine streams of multiple posts types (e.g. questions, answers and comments), and paging cannot be done on this stream efficiently while taking advantage of database indexes. I'm still thinking about the best way to get around this, without complicating the schema too much..."
answer from gidgreen, dated 9 Aug 2010
Welcome to the Q&A site for Question2Answer.
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April 20, 2021: Q2A 1.8.6 released!