You look for companies with bad business models, lots of barriers to entry, bad management. In the example of the PC industry, look for the weakest boxmaker compared to Dell. You can do this by searching the message boards and looking at the numbers. MUEI is an example of a bad company. You have to see if they have a lot of debt and can go bankrupt.
Net companies distribute shares as a payoff to various investors.
Exchange ideas and develop communication with them.