As you can see stated in some of your screenshots: Value based on 17.6% match rate from Twitter Partners
This is purely generated based on data supplied by those partners. You can find them here: https://partners.twitter.com/en/find-a-partner.html
It's not like twitter tracks the aisle you are in. Undoubtly facebook also enriches your profile like this with third party advertising partners. As does google and all the others.
House prices, could indeed be based on your location you tweet from. Sounds logical. I could actually also tell that to you, just by using the Twitter API and then matching up with data from some real estate website.
Income: most probably one of these partners matches up names with linkedin profiles and such and gets ballpark figures for job descriptions. etc etc.
There is no 'they' on Steemit. It is we, us, the blockchain. You don't need an email or phonenumber perse to register on Steemit, a facebook or reddit account also works, or you can use your service as you say... Steemit Inc is also not using that to track you, but to limit account creation abuse IMHO.
But yeah, in general, there is no such thing as a free lunch.
Whenever the service is free, you are the product.
I wholeheartedly disagree. With every ounce of my being. This is closer to the truth:
On Steemit, "They" is anybody who can read the blockchain. In other words, "they" is everyone. On Twitter, only Twitter knows everything about you. On Steemit, everyone does.
truth. thx phil!
steemit.com uses some fonts served by google. Your usage here is tracked by google at least.
http://fontfeed.com/archives/google-webfonts-the-spy-inside/
not saying this is good, bad or indifferent, just saying that yes, there is definitely outside tracking.
edit after looking for a couple minutes:
Not sure what information it keeps from other sources, but if you signup with facebook, it looks like steemit.com also keeps your registered name on fb and facebook email.
True. And also google analytics :)
Privacy Badger blocks their cookies, which helps to reduce their ability to track you, especially if you have a VPN turned on.
Yeah, i use something similar. For steemit at least, that looks like the extent of the tracking here (which is great). Though, oddly enough, steemit doesn't seem to be looking at your facebook data from your browser. It looks like steemit saves the name and email of the facebook account you signed up with. Im not sure who this information is or potentially could be shared with, but yes, they definitely collect and store it.
I used a sock-puppet facebook account to sign up for steemit, for privacy reasons, and the name and email from that account still seem to appear in pages served to me, even though im logged into my real FB account while browsing.
Thank you for your input.