Another social network, where I have created an account is Ryze.com. This website is famous for being the first professional social network. It was created before LinkedIn. It has many functions of a professional social network, where user can post articles, add friends, and join groups. In addition, users can have followers. Thus, I would recommend this site for people who are looking for professional networking connections. I, personally, seldom use this website, it was my first login this year. The reason is that I spend most of the time on LinkedIn. Still, it is a good alternative to LinkedIn.
Here is the link to my profile -
https://www.ryze.com/go/pliutkus