Hacker News now generates 10x the traffic of TechMeme
plus.google.com
plus.google.com
They appear to have been posted at different times of day- this can have a huge impact.
Also, the chart cuts off before the TechMeme traffic dies off- it already seems to have a significantly longer tail than HN traffic.
For what it's worth, I did a comparison of HN vs. Reddit traffic to my blog: http://blog.untogether.co.uk/post/17661390124/fun-with-analy... and Reddit absolutely smoked HN. Not that that's too surprising.
also, the last time I had a story on both HN was like 3x TM, so I think that scale is huge. Compete.com is probably off in terms of under reporting--but under reporting equally for both.
http://www.theverge.com/2012/4/16/2952030/user-interface-des...
and sites like BGR, MacObserver, ExtremeTech, ITWorld, Bostinno and probably plenty of others maintain a presence here dumping their links.