Marry Barra---First woman to become CEO of a major car company

Marry Barra born in December,1961. High school in wolford, Michigan.Now she is 57 years old.And her father ( Ray Makela) work in Pontiac.

In 1980, Mary Barra was 19 years old and a college student. In order to make money,she worked at a general motors factory in pontiac, mich.The job is to check the pontiac GrandPrix car, which has just opened, to see if its bonnet and shield fit.She contacted pontiac.(Pontiac,One of gm's brands.)

After graduating in1985,she joined gm's pontiac Fiero plant as an engineer and became a full-time employee.It has achieved excellent results in the manufacturing sector and has also served briefly in human resources and public relations departments.

On February 1, 2011, he was formally appointed senior vice President of global product development of general motors, responsible for the company's global automotive design, engineering, project management and product quality.

In August 2013, he was appointed vice President of global product development and global sourcing and supply chain of general motors.

On December 10th, 2013, according to foreign media reports, gm will appoint Mary bora (MaryBarra) as the next chief executive, replacing the current chief executive Dan exxon (DanAkerson), the latter will be retired in 2014.

On the Barra table was an image of an Einstein

Einstein's portrait is placed on the Barra table with the car model.In an interview with bloomberg businessweek,The figure is a prize that Barra won in a commercial competition for executives who can beat gm.

I was going to buy the snow 

  A friend of Barra told bloomberg businessweek plot, said Barra originally wanted to buy snow franco  CAMARO car (wasp), but at the last moment to give up, because Barra worry about his son for the roadster plaything weary in well doing.

April has just opened twitter

But since then only two tweets have been sent.One was a picture of a new Cadillac, and the other was to raise $2.5 million from the Karmanos cancer center.So far, Barra has about 1,800 followers on Twitter.

Goal: "reject defective products."

"Eliminating defective products" is the main goal of Barra for general engineers and designers."Before there is a variety of restrictions, let the car design and manufacture of timid, but now we want to eliminate these constraints, whether budgetary, resources, we are going to break all the constraints, to create successful cars and trucks - this is our own lies".In short, there is no inferior quality.

She is  the first woman to hold the position.

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问题：

1 . How many tweets did she post on twitter?

2  Why is there a figure on the barra table?

3. What is the meaning of "twitter"?

4. What brand did she contact with gm?

5. what's the meaning of "reject precetive products"?