Ian followed your vote on Rob, despite saying he thought he was town. That seems pretty odd to me. Why not defend Rob if he thought he was town, AND Rob was contributing a lot to town. It looks like Ian wanted Rob out of the game, and may have been using your initial vote on Rob to pass the blame over to you.
Sera claimed to have a rock, and that wasn't countered by a 3rd person saying they had a rock, so I assume they do. If mafia had it, I think they might keep it quiet, and try get rid of whoever sent the rock to keep them from saying they threw the rock to Sera, and that they weren't passing it on in line with the plan.
I'm not sure about Demagog, he posts information and opinions, then says they're not serious and not to listen to him. Maybe he does actually want us to listen to them, and he's not being serious about telling us to not take them seriously.