Just made it in time to the next session at AoIR 2023, which starts with a paper by Yiran Duan on deleted tweets. The focus here is on deleted tweets in the #BlackLivesMatter hashtag during three key periods (including Black History Month in 2020 and 2021 and a police brutality trial in 2021). Some 37% of these have become unavailable in the last couple of years. This is comparable to the 33% of deleted Brexit tweets (but that deletion rate occurred in four years), and much more than 19% generic tweets deleted in four years that other studies have …