They can be incredibly annoying and pointless, but not always. It really depends on the users you engage with.
Basically, if you post rumours about a game that's possibly in development and you say they are just rumours, they should know it's only rumours. It's speculation.
Then some of the respondents are being like, "OMG. You shut up. Why are you falling for this rubbish? Why are you gonna egg your own face?"
Damn. Like, calm down. For crying out loud, it's just a post a guy made to maintain a level of gaming talk during a quiet spell for proper news. My goodness.
But yeah. I don't know why I still use these gaming message boards to vent about things. And they say boredom is a sin, huh?