According to a Bloomberg report, the revelation by Capstone Investments that the number of Facebook users had witnessed a plunge in the last six months, the social networking company's stock dropped 2.8 percent to $27.45 at
10:53 a. m. ET on Tuesday; thereby extending the losses reported on Monday.

The fall in Facebook shares was apparently an upshot of a Capstone report - authored by analyst Rory Maher - which disclosed that, during the last six-month period - the US user base of Facebook social network had dropped
1.1 percent.

In addition, the Capstone statistics also revealed that in 14 of the 23 `successful' Facebook markets, the user base of the social network has either witnessed a fall or had hardly shown any growth during the last three months.

About the plunge in Facebook's user base, Maher said that it was with the help of proprietary software that he had tracked user numbers by country, in the last six months, across over 200 countries. Maher said that the figures clearly showed that the social network had lost users in the US as well as in Europe.

In his report, Maher said that the fall in Facebook user base in the US and Europe could be "an issue for Facebook growth," especially in the wake of the fact that it was being estimated that "outside of Southeast Asia and some countries in Latin America, most markets are approaching 50 percent penetration."