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Rick Wicklin

The lack of standardization seems the biggest problem. I would have preferred to see the data as a "percentage of all users of social media," which would have enabled comparison across different sites (as you point out).

Like you, I wonder why the various sites are displayed horizontally in 3 graphics, but vertically in the Site vs. Age graphic? I critiqued a similar chart of social media usage by age last year: http://blogs.sas.com/iml/index.php?/archives/55-How-Does-Participation-in-Social-Media-Vary-with-Age.html

Jörgen Abrahamsson

There should have been ordering to show the patterns in the data. That is the main problem.

The tetris look is a bad solution but there is a case for using
actual visualization of the data(60%,40%) instead of just the proportionality of those numbers(6:4 or rather 3:2).That is what a standard (stacked or not)bar chart does. When practical I think it is better to show the actual numbers.

I´m not sure you can say that relative numbers are the wrong choice. Relative vs absolute numbers are allways an issue. I find the relative question as interesting.

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