Someone asked how you find when you joined.
Thanks to @phase I finally know how.

1. Go to your profile choose edit
2. Enable your personal landing page (plp)
3. Click on the link to your plp
4. Date shows up on the bottom of your header (12/2017)
Bonus what's your join #?
1. Click on your profile
2. Edit the hyperlink
3. Last # in hyperlink is the order you joined (13797)

No matter when you joined, glad you are here💜