Extremes should always be evaluated carefully. Social media's place in the CS field has two main reasons for me.
1) To show how the mind works and to showcase it on a CV.
2) To be available to this thing called the 'internet' which is basically a giant global party where the only information that we can find out about one and another is either through what others say about us or what we say about ourselves. If I purpose a crazy solution to a problem you will most likely want to verify who I am to see if my idea has any credence.
The article is right that it is a distraction but for CS minds to come together and share ideas it is almost a necessity to help drive innovation.