  Twitter data has become established as a valuable source of data for various
application scenarios in the past years. For many such applications, it is
necessary to know where Twitter posts (tweets) were sent from or what location
they refer to. Researchers have frequently used exact coordinates provided in a
small percentage of tweets, but Twitter removed the option to share these
coordinates in mid-2019. Moreover, there is reason to suspect that a large
share of the provided coordinates did not correspond to GPS coordinates of the
user even before that. In this paper, we explain the situation and the 2019
policy change and shed light on the various options of still obtaining location
information from tweets. We provide usage statistics including changes over
time, and analyze what the removal of exact coordinates means for various
common research tasks performed with Twitter data. Finally, we make suggestions
for future research requiring geolocated tweets.
