  The most surprising observation reported by the study in (arXiv:2208.13523),
involving stance detection of COVID-19 vaccine related tweets during the first
year of pandemic, is the presence of a significant number of users (~2 million)
who posted tweets with both anti-vax and pro-vax stances. This is a sizable
cohort even when the stance detection noise is considered. In this paper, we
tried to get deeper understanding of this 'dual-stance' group. Out of this
group, 60% of users have more pro-vax tweets than anti-vax tweets and 17% have
the same number of tweets in both classes. The rest have more anti-vax tweets,
and they were highly active in expressing concerns about mandate and safety of
a fast-tracked vaccine, while also tweeted some updates about vaccine
development. The leaning pro-vax group have opposite composition: more vaccine
updates and some posts about concerns. It is important to note that vaccine
concerns were not always genuine and had a large dose of misinformation. 43% of
the balanced group have only tweeted one tweet of each type during our study
period and are the less active participants in the vaccine discourse. Our
temporal study also shows that the change-of-stance behaviour became really
significant once the trial results of COVID-19 vaccine were announced to the
public, and it appears as the change of stance towards pro-vax is a reaction to
people changing their opinion towards anti-vax. Our study finished at Mar 23,
2021 when the conundrum was still going strong. The dilemma might be a
reflection of the uncertain and stressful times, but it also highlights the
importance of building public trust to combat prevalent misinformation.
