Might be nice to add the Russian sites OK and VK. I have a VK account (it is available in English). Not sure about OK but it is also on the share options for youtube videos (so I assume both are popular enough to be included).

https://ok.ru/
https://vk.com/

VK was considered on the spreadsheet and rejected due to being too regional. For everything we support we're creating an SVG icon, and it'll be available for quick-setup in the UI, and will need to be maintained, so there are some limits on this otherwise it'll overwhelm (including users). However anyone can add new CPFs for things not available by default.

Here's VK's usage...

https://en.wikipedia.org/wiki/VKontakte#/media/File:Most_popular_social_networking_sites_by_country.svg

So I wouldn't deny it's popularity, just it doesn't meet the criteria, and I think the criteria I've picked are the right ones.

Adding some more...

PlayStation Network
Xbox Live
Steam

Plus I decided we will do VK, and some other very regional networks (VK, Baidu tieba, Sina Weibo, TecentWeibo, Line, Viber, WeChat, QZone).
I have been helping out a Russian user recently, and it made me think a bit. We're not all going to be one world socially - Russia and China and Japan all have very segregated Internet services, for cultural/political reasons. They're really another world in some ways. If we want to promote Composr as a platform for people in these countries, rather than either Western-centric or global, and if we want to keep translators happy, we should really do it by number of users.

Still no love for Last.fm. Their API seems to be working again (potentially allowing scrobbling from Galleries or outputting recent tracks on the profile). If Bandcamp and Soundcloud are there then Last.fm should be imho (I love seeing the history of what I listen to/scrobble).

It's dying I'm afraid, objective proof:
https://www.rank2traffic.com/last.fm
https://www.rank2traffic.com/spotify.com
https://www.rank2traffic.com/soundcloud.com
https://www.rank2traffic.com/bandcamp.com

You can see it had "Internet phenomena" traffic, but has been in massive decline, and even Bandcamp is now bigger (and growing). Plus Bandcamp is a special case as I want to help Composr users sell things more easily (same idea as having Patreon links, Amazon wishlist links, PayPal links).

Well last.fm is more of a service/app that doesn't really require regular visits to the website for it to be useful and the traffic has halved over time but I'm not seeing an obvious downward trend on that graph over the last few years. Not arguing for it to be added but I'll certainly add it myself as I don't think it's going anywhere anytime soon :)

https://noisey.vice.com/en_uk/article/a37x9g/lastfm-was-the-only-music-social-network-that-made-sense

Okay, you clearly have a point but I've used it since 2006 and I still think it's great.

Any data on financials? If it's making a profit I might be swayable.

Can't find any financial news beyond the CBS aquisition where they were trying to stem $4.4 million in losses. I assume they're breaking even at the least. Surely they won't they be operating at a loss unless they're doing it out of love and I assume if there were plans to close the site they would have been annouced way before this point (when everything went tits up with the site redesign everyone hated). No 2018 news to be found so nothing I can really persuade you with :)

Let's just say, they've probably got more money than me if they've got £4.36 :P

I thought I'd take a look, and I was genuinely shocked/interested:
https://suite.endole.co.uk/insight/company/04569646-last-fm-limited

Their worth on balance sheet is -46mil, and they've been increasing debts of about 2mil every year.

CBS is only keeping them alive because they hope either:
a) someone else will take it on to cover most of their losses
b) it will suddenly become popular again
c) it's user base can be shuffled into making some hot new service take off
d) nobody wanting to face facts / internal politics / embarrassment
e) a couple million a year isn't enough for CBS to make a decision on it (they make $13590mil each year)
Probably a combination of those things.

Well they are still active on social media platforms and still responding to feedback/bugs. Sounds like CBS tried to save it and ended up stifling development but I am hoping b) happens because despite the financials and redesign which stripped some of the features away I still use it daily. Perhaps it shouldn't be added as a default, it's more a niche for scrobblers than anything else but that was the main selling point originally :)

Added:
Steemit
DTube (built on Steemit)

These are very new, innovative, with great traction, and are solving some of the problems of sites like Twitter and YouTube. So we'll include them.

Added Diaspora and Mastodon, in light of the #DeleteFacebook situation right now.
I didn't actually know of Mastodon - it implements ActivityPub, has some traction, and effectively deprecates a whole host of other fragmented projects

Still, Diaspora, Mastodon, and Steemit each have limited users. I'm only adding them here as non-commercial projects I want us to give them a bit of a leg-up - and they are more likely to get traction over an extended period as there is passion and social progress behind them.

I'm hoping Diaspora and Steemit both implement ActivityPub, which is a new W3C standard that comes from Mastodon's family tree. Then we have all these alternative systems moving toward being unified.

Nice. Diaspora has been around a while now (since 2007) so I've heard of that one. Never heard of Mastadon or Steemit and I've not used any of these networks before but I approve of the additions (and subsequent exposure) via Composr.

Glad you added DTube due to the many issues YouTube is experiencing (including lots of unhappy content creators).

Does Composr also work as an oEmbed provider now? If so, optionally allowing this social profile data to be embedded elsewhere might make this more of a profile feature than a profile addition.

Moving off-topic, other media (galleries, downloads, etc) being optionally offered as embeddable content would be great for those who wish to provide their content to others (viral videos for instance).

oEmbed discussion is off-topic for this issue, this is strictly about adding some CPFs. There's another issue for oEmbed somewhere.