How to index links profile in google?

I always wonder how Google can index social network links, book marks. I need 1 advice, please!

with backlinks on social websites or you can use speed-links or omegaindexer

GhostVision said:

with backlinks on social websites or you can use speed-links or omegaindexer

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Thanks so much

I've got my profiles indexed last year bombarding them with over 100k social signals. But I'm not sure if the profiles will stick (on those websites I mean) cause yesterday I randomly checked several of them from the 120 profiles I've built last year and I freaked out when I noticed that those that I checked returned 404 pages. I didn't want to check all others after this. But apparently the links are still in google, which is weird... Oh well, I'm not complaining about this particular aspect

Anyway, social signals might be your best bet cause I understood that most indexers don't work nowadays