I mean the whole idea that it's suspicious to do more than just show up and cast a hit and run vote on Day 1 is colossally dumb for a number of reasons. First of all, most mafiosos try to lay low so they're among the most likely people to do nothing more than vote. Second, by going after people who do more than vote on Day 1, you incentivize people to not post anything that could give someone else something to latch onto, and in the long run you end up with less information with which to evaluate people.
Seriously like every game 10 different people's Day 1 posts get flagged as "sketchy" or "weird" and what percentage of those people end up being mafia? I would guess it probably comes close to matching the percentage of the players in the game who are mafia. We should be voting for the quiet people
/endrant