Hello,
Some administrators decide to merge two forums, so in case you were active in a community and merged into new one do you continue posting on new community or it depends?
Its seen as a easy way to boost post and topic counts in forums. To me, it brings a sudden rush of members and posts that I am not acclimatised with and I feel very foreign in being part of a forum that is not what I thought it was just a day after I previously posted.
However, if I have built loyalty to that forum, then I see, why not.