It appears that Pixel Federation has now fully enabled the ability to add Friends through the Pixel Federation Games Portal. The ability to add Friends has existed previously, but they did not count towards game content. Friends can be added through the Pixel Federation Portal using their email address they signed up with for the Portal.
If you are comfortable publically sharing your email address, feel free to post to this thread. I will be keeping track, so please do not start opening numerous threads for friend requests.
UPDATE: It turns out that you can directly link people to your profile page to add you as a friend. In order to produce the link, I have gone to my profile, linked to a friend's profile, and under their friends list found myself and used that link to return to my profile. This is somewhat convoluted, but will produce the URL with your profile ID.
Questions:
Does adding friends through the portal also add them to your FB account?
No
Adding emails as friends on the Pixel Federation Portal site count towards gameplay but have nothing to do with your FB account?
Yes