API/Scraping Question: Any way to retrieve a list of members for a Community?

API/Scraping Question: Any way to retrieve a list of members for a Community?
This is mostly for my fellow developers: is there an easy way to get a list of all members of any Community?

I know that Community owners can get a list through Google Takeout, but I'm interested in getting such a list for communities of which I'm merely a member, rather than an owner.
Preferably through one of the APIs, though scraping would also suffice.

One of the reasons for this is that I'd like to be able to have my script generate a list of alternate social media profiles based on the (public) links in users' Google profiles.

For instance, specifically for this community it would be interesting to see how many users have set their MeWe/Medium/Blogger/Mastodon/etc urls in their profile yet, and which platforms are the most popular based on that.

Based on my own Google+ Circles Takeout JSON files, here's an example list of most listed platforms in the users' profile links section:

Found 506 platforms:
— Twitter (132 items)
— Facebook (88 items)
— LinkedIn (57 items / 55 unique items)
— YouTube (58 items / 54 unique items)
— Blogger (48 items / 44 unique items)
— PicasaWeb (37 items)
— Flickr (37 items / 36 unique items)
— Google+ (30 items)
— Google Reader (22 items)
— Instagram (19 items)
— GitHub (19 items / 18 unique items)
— Wordpress (17 items / 16 unique items)
— Quora (14 items)
— LastFM (12 items)
— Pinterest (11 items)
— Tumblr (9 items)
— Delicious (9 items)
— 500px (8 items)
— SoundCloud (7 items)
— Wikipedia (6 items)
— Vimeo (6 items)
— Diaspora* (5 items)
— SlideShare (5 items / 4 unique items)
— Live.com Profile (4 items)
— Digg (4 items)
— DeviantArt (4 items)
— Patreon (3 items)
— Medium (3 items)
— LiveJournal (3 items)
— Friendfeed (3 items)
— Foursquare (3 items)
— Cafepress (3 items)
— AboutMe (3 items)
— Orkut (3 items / 2 unique items)
— MySpace (2 items)
— StumbleUpon (2 items)
— SourceForge (2 items)
— Reddit (2 items)
— Pandora (2 items)
— NetVibes (2 items)
— Keybase (2 items)
— Hyves (2 items)
— GoogleCode (2 items)
— Goodreads (2 items)
— Ello (2 items)
— Dreamwidth (2 items)
— Dopplr (2 items)
— Disqus (2 items)
— Bandcamp (2 items)

The 'Diaspora*' entry is based on a list of most popular Diaspora* pods from the public instances list.
Obvious personal domains, or product pages such as Google's support documents, are excluded.

Surprisingly, none of the people I have in my Circles, apparently have their MeWe URL in their Google profile. It also surprises me that I have so few listings for Diaspora*.

Then again, based on the high amount of dead services still included, such as PicasaWeb, Google Reader and Delicious, I'm guessing that a lot of people (me included) have only bothered to set up the links section when they set up their profiles, and haven't kept it up to date since.

I'm still refining the output and data gathering for this analysis feature of my Plexodus-Tools script (https://github.com/FiXato), but I'll hopefully have this committed and pushed to the repository in a few days so other devs can start playing with it as well. :)

Anyway, to re-iterate my question:
Is there an easy way to get a list of all members of any Community?