You can refer to the people in a particular place or profession who spreadgossip as the gossip millor rumor mill, which is considered as a source ofunofficial and unreliable information.

某地或从事某种职业、专事传播各类八卦消息的人，可以称之为gossip mill 或rumormill，即“谣言工厂”，同时也是各种非官方和不可靠消息的集散地。

For example:

Many of these gossips centred around Gosling, whose continued absence onlyserved to fuel the rumour mill.

很多八卦都跟Gosling有关，而他一直不现身更是助长了各种谣言。