I'm a frequent Reddit user where I love sharing content from my website - hobby stuff, worldbuilding and such. I have several links there, and some more on Twitter and little on Facebook, but barely anywhere else.
Are these add up to the search engine rankings of my site?
If no, what's the reason?
If yes, are all sources equally "strong"? What determines the "strength" of a social media link? (by strength, I mean that obviously, a link to my site on a fresh site is not the same as the same link on the New York Times' site)