Plenty of companies that sell "real products" or that you can walk into have come into trouble (have you tried walking into a Circuit City lately?). The answer

Plenty of companies that sell "real products" or that you can walk into have come into trouble (have you tried walking into a Circuit City lately?). The answer is to have a well diversified portfolio so that you can capture the value of giants like Facebook and still not tie yourself to their long term prospects.