After that, I never installed it again (but too late), and I bought a second (non-smart) phone.
It vacuumed the contacts and spammed them with "Join me on WhatsApp". One of the reasons for their initial exponential growth.
Now lots of contact forms (not even necessarily job related!) are treating it as a required field. Pretty distasteful situation.
Confirmed 5 years later in media; https://www.bloomberg.com/news/articles/2013-09-20/linkedin-...