Increasing Spams shadow Valuable Information

Though there are many spam filters developed to stop the increasing amount of Spams, in forums of social communities like Orkut, people are finding easy means to advertise their products or websites or communities by means of flooding each and every community. Some people there join 100s and 200s of communities and flood those forums with advertisements. Result of this ? Many valuable information gets unnoticed. Even if a person wants to see something, he is not able to find what he wants. He sees something, and think that it is a spam or something like that, and dont get into see what it is actually. They fear of advertisements or spywares or viruses. People who did not know about these gets into the trap. So if there is something posted usefully, it is good to reply to those so that others will know that it is not a spam.