Just noticed a few of these, where the thread begins with a negative statement (not a question) about a political party.
Obviously, anyone who was employed by a party to masquerade on social media would join in a smattering of other threads to make it look less suspicious- and that does indeed seem to be the case- but the main thrust is to begin political threads that make sweeping negative statements about the opposition.
Anyway, I am suspicious and I hope that Mumsnet look into it.