1.To sell collected shares at a higher price to increase the capital gain.Then if you are lured to buy at the peak you lose but the manipulator wins. Fake news, rumors are widely used for this in forums for this.
2.To bring down the price of a share that has a great future value to collect at a lower price. Creating Panic and adverse campaigns carried out in forums are used for this.
I have noticed both in this forum. Be ware. Try to identify manipulatory attempts. Do not be carried away. Of you hold good shares stick to your targets.Then you can over power the manipulators.
When second type manipulators are at work you can see very aggressive anti-share campaigns. They may even used foul language against each other.
There is another type of manipulatory campaigners. They are the agents of rival companies. They use the jargon related to the sector very well as they are also from the same sector and they are very familiar with the sector jargon. They carry out such campaigns in an organized manner.
Do not use any forum to look for "Buy" or "Sell" recommendations. We can find useful information in forums but do not let them blind you.
One dirty manipulatory attempt is still going on in this forum these days. One team is using every thing to bring down PCH. Some are trying to rise it sky high. Now the cat is out of the bag. Can you see new posts appear in favor of Softlogic.
But sift logic is not coming as an IT company. Their IPO is to improve their Finance Company (Soft Logic Finance of Soft logic Holding)
http://www.dailynews.lk/2011/02/01/bus03.asp
Do not be blind followers of forums.