In a textbook launch, India's Polar Satellite Launch Vehicle (PSLV) on Monday successfully placed into orbit remote sensing satellite Cartosat-2B and four other satellites after a perfect lift off from the spaceport here.

It has been quite a Buzz for Google during the past week, ever since they unveiled the new social networking platform on February 9.

In the largest human trial of an AIDS vaccine till date, involving more than 16,000 volunteers in Thailand, scientists found that HIV infections were prevented in over a third of the 8,000 people who received the vaccine.

Terming its competition with search giant Google as "healthy", Microsoft India on Tuesday said competition will help spur innovation and that it aims to introduce a range of new products in the next one year.

Beyond simply adding a new layer to the conversation and allowing your readers greater flexibility in how they choose to respond to your content, it also adds an important factor in “going viral”: social proof