Is @LabourRemain official? what else to follow?

I am trying to find out what is going on with the organisations that operate now. This may offer clues to what happened during the referendum. So @Open_Britain and @Change_Britain I can just about follow. But @LabourRemain seems to be the same name but just concerned to oppose Jeremy Corbyn. I just had a look and it seems whoever is writing the tweets may be under pressure to moderate somewhat. they may or may not represent some scale of Labour opinion. But was this take on Corbyn always there? If some were looking for a chance to blame Corbyn for a poor result would this explain some lack of communication? I still think we have not had much of a story from the proper journalists. They know much more background than has yet been published. Meanwhile I will try some checks to find other tweets. I thougt Corbyn was very effective during the referendum on social media, but I may just be in a bubble.