Seriously? Are we remembering the same trollbox from poloniex? I am pretty sure 90% of the chat there was people who keep on saying "buy xyz" on whatever the coin they have that they bagged and want to sell. They were trying to spam the chat with coins so eventually if a newbie sees and buys it.
There was no proper chat there at all and it was so fast that there was no chance of actually chatting there neither. It resembles the twitch streamers chats, there is about 5-10 messages in there every SECOND which means no human could read ALL of the chat and most of the chat just went to waste. Poloniex trollbox was named trollbox for a reason, they sucked big time and it was just purely spam from morning to night, there was very rare non spam posts and they went wasted among all the trash there.
I know what you are talking about. And this only started happening recently, due to the poor design of the trollbox if there was too many posts at once it was very hard to follow.
However it only happened because they got a surge of new members and it was mostly people spamming however before all this hype it was a good place for news and other update to date crypto info.
Unfortunately i've never used BTC-e so I have never frequented their trollbox. However if I had to list in order of rank I would say that the Poloniex, Primedice, McxNow were among the top 3 crypto trollboxes of all time. Most people never heard of Mcxnow but they had a trollbox and if you were a miner in 2014 then you mostly used their exchange to sell your Maxcoin, which was very popular back then.