It's been used both ways in newspapers for nearly a century (cf. 1919 cite from http://itre.cis.upenn.edu/~myl/languagelog/archives/004971.html), though perhaps not equally. But "think" outnumbers "thing" in pre-1960 Google Books by a couple orders of magnitude.
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timeasmymeasure
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Date: 2011-08-29 06:02 am (UTC)Huh.