Just a thought about bandwagons and first days: don't just jump into it. Make sure that you're thinking through each step you make and what you are actually posting. Bandwagons are good when the day is almost over, there is no motion in the game, and they are the only good lead. There are a few other instances where bandwagons are good, but for a beginner's level game, you should develop skills necessary to get through the day without just jumping on a bandwagon.
Also, make sure that if a bunch of people are voting for someone, that you wait and let them defend themselves before "hammering" them. (Hammering is letting the last vote happen, thus killing the individual.) You haven't reached that point yet, but you should probably watch out for it.
As for some advice to help you out just a smidgeon right now and throughout the game... You can actually look at a list of those that posted, the amount of replies that they've made, and links to a page of their posts so that you can use them for evidence. To call up that list, go back to the Mafia board, and then click on the number near the "replies" in the thread information. For your convenience, here is the link for this specific thread.
http://zeldadungeon.net/forum/misc.php?do=whoposted&t=28991 . A good strategy that myself and many others use is to look over posts of individuals in
isolation. Reading them in isolation can help you see a specific trend or even a particular "meta" of a player. A "meta" in Mafia is
usually defined as a general behavior that they are exhibiting. It is up to you to determine if it is scummy or not. However, it is still really early in the game, so you probably won't be able to get much out of isoing individuals.
Hope I helped.