May 1, 2018 06:39:14 AM by Pat M
Nahid, since you have so many questions have you considered also becoming a Client? You could post a job or jobs, hire someone(s), and pay them for their opinions.
May 10, 2018 02:49:27 PM by John K
I hope I won't be suspended for doing free web research, but this may shed light on the question:
https://www.alexa.com/siteinfo/upwork.com
May 11, 2018 04:36:17 AM by Nichola L
Thanks John, I haven't visited Alexa for ages. There was a time when all info on Alexa was free . . .