LONDON -- In this edition, Motley Fool editor Sam Robson asks Motley Fool Share Advisor senior analyst Nate Weisshaar about the power of social media and whether social-media companies are worth having in your portfolio. Under scrutiny today are Facebook (NASDAQ:FB)LinkedIn (NYSE:LNKD), and Rightmove (LSE:RMV).

Investing is by no means easy in today's uncertain economy. That's why we've published "Top Sectors for 2012" -- our guide to three favorable industries. This free report will be dispatched immediately to your inbox.