Nowadays, most of the companies have been considered and used social media as an efficient, effective marketing tool. The social media would be beneficial to the companies but also be challenging to them.  What would be the advantages and difficulties of companies when implementing social media marketing?  You may consider the general point(s) in doing business as a whole and/or the specific point(s) with your experience in daily life.

Definition Definition Degree to which financial markets incorporate all available information into the prices of assets. In a more efficient market, the prices reflect the available information more than that in a weak efficient market. It is difficult for investors to outperform the market in a strong efficient market. This is because all the available information is already discounted in the asset's price. However, in a weak-form efficiency, the market does not reflect all information in the asset's price. As a result, it becomes easier to generate better returns in a weak form or an inefficient market.