The problem with using the strategy of seeming super suspicious (because the killer obviously wouldn't want to seem suspicious, right?) is that nobody has anything else to go on right now so all they have to latch onto is the vibe you give off. One wrong sentence here, one wrong question there, jumping on bandwagons, making accusations, doing nothing at all... it's easy to find yourself at the end of a noose.
The smartest ones are probably the people that have been around here all day but strategically haven't said anything at all. Heck, if I was playing I'd be most worried about those people.
To be honest, I think the most damning thing of all is actively keeping track of votes in the thread publicly. It just leads to people bandwagoning and not even considering anyone that isn't already being jumped on. But, that's just my thoughts...