Agreed that people who think the stock may go to 30 cents can influence certain investors to sell, but I see more people who have a negative influence by giving a stock unlimited and unfounded praise, which may lead people to buy or add based on invalid arguments. Although they may sound more sympathetic to us because they say things that we like to hear, it is just as annoying.
I think people should take their own decisions whether to buy or sell and if they follow advice from someone on a message board whom they never even met, it's their loss... that's how we all learned as modern day online investors.