Lawyers are by genes non believers, they can work through facts. This chart is based on Statista.com and Wikipedia data. You might already know Wikipedia can be tricked and manipulated (Manipulated-Wikipedia-Watch-from-07_26).
You can read about the 3 professional networks here:
Comparison of the usage of LinkedIn vs. Xing vs. Viadeo for websites 3wtechs telling this:
This report shows the usage statistics of LinkedIn vs. Xing vs. Viadeo as social widget on the web. See technologies overviewfor explanations on the methodologies used in the surveys. Our reports are updated daily.
And that the 2.1% of the top 1000 websites has Linkedin widget. While the other two are 0.0% (W3Techs.com, 11 July 2014)
Google Trends (2004-2014) click to get to chart
XING lets you choose which details you want to share with other people.
This is very important message nowadays, after US spies in Germany, NSA issue...
And have to admit, that 's (60 million users) front page is also much better than Linkedin's.
But the above figures tell us something about the other two professional pages...
@TamasBANKI is a Linkedin Expert (DrLinkedin). Joined Linkedin in 2007 and helped over 1700 professionals and students with Linkedin.