Sharing to Twitter and Facebook
The forum allows sharing of posts to both Twitter and Facebook - to do this, click on the three vertical dots at the bottom-right of a post (image below is from a desktop browser, but it's more-or-less on the same place on mobile), and choose which of the two you would prefer.
However, please keep in mind that while the forum allows you to share from anywhere, please only share from open parts of the forum (ie, please don't share from any of the closed groups or the non-public discussion area). Shares from these areas won't be viewable by anyone who doesn't already have access, and will just confuse whoever is looking at it.
If you have any questions please ask - happy sharing