Description of problem:
That means it likely does not work, and certainly won't work reliably.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. run ldd on it
$ ldd /usr/lib64/nautilus/extensions-2.0/libnautilus-tracker-tags.so | grep gtk
libgtk-x11-2.0.so.0 => /usr/lib64/libgtk-x11-2.0.so.0 (0x00007f9a0476b000)
libgtk-x11-3.0.so.0 => /usr/lib64/libgtk-x11-3.0.so.0 (0x00007f9a0360d000)
Fixed in tracker-0.9.33-1.fc15.