This is what you need to know before the opening bell:

 1. Facebook  (FB - Get Report) approaches 2 billion users. The social network currently boasts 1.94 billion monthly users & 1.3 billion daily users

2. FTSE 100 boosted by first quarter earnings reports. HSBC  (HSBC) & Shell  (RDS.A - Get Report) both beat analysts' expectations

3. Federal Reserve expect the U.S. slowdown to be temporary. In the first quarter, U.S. GDP grew at its slowest rate since the first quarter in 2014

4. Britain's Prince Philip, the Queen's husband, to retire from royal duties in Autumn. Aged 95, he is the oldest member of the royal household

5. Eurozone retail sales increased for the 3rd consecutive month in March, showing shoppers are yet to be deterred by rising prices

This article was written by a staff member of TheStreet.