I'm probably a bit late to the topic, but I'm firmly in the 'NO' camp for this one.
There's no accountability and no accreditation. You're relying on investment advice from total strangers, who may sound confident, but could be total amateurs themselves. You have no way of knowing for sure who these people are, whether they have any background in finance or economics, or what their level of experience is.
Worse still, there's also the chance someone in the group (or even multiple people in the group, if there's collusion behind-the-scenes) could be influencing others to invest in ways that profit the people giving the "advice" and taking advantage of those receiving the advice. You could easily be fresh meat for the grinder and not even realise until it's too late. There's so much potential for a seriously bad outcome.
As a general rule, if people really knew how to make a guaranteed profit doing this, they would probably keep that info to themselves and rinse the market for all it's worth. They're not likely to share the secrets of how to make that profit with total randoms like you or I. You are more likely to be the source of that profit for them if they can turn you into their puppet.
After all, its never too late for a good argument. Okay, I get your worries. Investing advice on the internet may be like the wild west, with few reliable authorities to rely on. The surface explanation is incomplete. Someone with a gloomy outlook would conclude that everything is an illusion and that a powerful elite is plotting to exploit us for financial gain. But that's making generalizations. Even though its a fact, generalizing about all internet discussion boards would be unfair.
Imagine helpfully that online groups are like underground vaults full of hidden gems. The garbage piles up, thats for sure. Pearls of wisdom, however, can be unearthed if one looks deep enough. Never invest blindly on the advice of others; instead, exercise extreme caution, probe for clarification, and conduct your own investigation. And keep in mind that having faith in complete strangers online is not the same thing as having an optimistic outlook. Actually, no.