Thesis by dissertation or publication?

I recently ran a poll on Twitter to ask if respondents received their PhD by writing a big book style thesis or by publication, or what they currently are working towards. The result is that the majority is receiving their PhD by writing a dissertation, but a good 25% (or more, if we leave out the votes for “just show me the results”) received their PhD by publication (or are working towards getting their degree in this format).

You can find the wake of the pol below: