Google Scholar provides not just a list of publications (which is of course part of the application, and which is also [available on dblp](http://dblp.org/pers/hd/j/Jung_0002:Ralf)), but also a citation count and computation of several publication-related indices.
This post is about why I don't have a Google Scholar profile (yet).
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First of all, having a Google Scholar profile requires a Google account.
There is no technical necessity for this, Google already indexes my papers and other databases (like the aforementioned dblp) manage to create per-author pages just fine without authors having to have an account.
But, of course, this is a great way for Google to tie more people into their ecosystem -- few kinds of pressure are as effective as when this directly affects hiring decisions.