Switching your profile to private so that trade trackers like TF2Items can't log it, and then making your profiles public again. Appears to be innocent, and an item can be passed along between scammers several times without detection by anybody but Valve (since they have limits on the public API as far as the true trade histories of any items).
It's up to each community. There've been a few people who I had tagged for fake rep who were able to provide sufficient proof that they didn't have any intent to falsely inflate a scammer's rep. I had their tags lowered to CAUTION for a while, and then eventually had them removed entirely.
From what I can tell, yes. There's several people in this ring, all friends with each other, posting on each other's profiles. A bunch of them are already tagged on SR by different communities for other reasons. One of which that I recall off-hand was impersonating Kobra, who used to be a SR middleman (understandable why he'd step down these days).
My primary concern is why you're sharing the same name/avatar as other users and posting rep on each others profiles. Even if you ignore the dozens of other people involved in this, why would you copy the name/avatar of somebody else? It doesn't even look like impersonation, either, since you both share the Shikze as a friend, who has also relentlessly posted on scammers' profiles.
![[TC]CreepingDeath](/data/avatars/m/0/26.jpg?1352268746){kind=avatar}