This is from TOEIC writing test.
I think the best way to find a job is personal recommendations.
Personal recommendations are more reliable than other media.
If I apply a new job by using other media,I have to explain what I can to the company.
But that is just "explanation" not "proof".
Personal recommendations can give a credit for the company.
In other words,that is "proof".
Actually,my ex-collegues found the jobs through personal recommendations.
I think the person can get recommendations has ability to make a good relationship with everyone.
It's necessary to do good job.That's why personal recommendations must be "proof".