if your are in a campaign your post must be related to the question and your post must be in allowed board or thread . First you need to read those rules to know where board you must post and to prevent breaking rules cause i see you are new here. And also about multiple signature campaign i think no! because that is part of rules which is if you caught joining different campaign you will be given a red trust or maybe You will be banned in the campaign which is you will be listed on the smas list of campaign manager.  So must read the rules first before you joining in any campaign.