What I am trying to say, i guess, is someone will make money out of this, manufacturing fake twitter profiles with real looking history.
Now, the thing is, though, it's hard, because at some point your "followers" and "followings" have to be real people that interact with you ideally.
It can label the checkbox "Make America Great Again".
I suspect that's a fraction of a percent. Are there any cites for higher numbers?
I couldn't find statistics, perhaps mainly because googling "facebook post frequency" or similar gives you 1000 SoMe SEO tips&tricks pages.
Any data that isn't obviously fake can help build their profile of you. The idea is that they can build on that profile when you do become a person-of-interest.
I tend to be on the not bothered end of the spectrum[2] and I'm a bit wortied by the direction it's going in England with more stuff gathered, from more people, with less rigorous oversight.
[1] there are many different forces in England
[2] mostly because I saw regulation getting better. There are problems with RIPA, but it stoppwd some abuses.
Aren't most people's friend lists on Facebook consisting of 80% "People I went to school / university / work with"? In which case government already knows? Once we gets to "connections pf connections", you're looking at a set of many thousand people with no real indication of how strong the connection is. E.g. some of my best IRL friends I haven't even added on Facebook, but I have several people as FB friends that I haven't spoken to in a literal decade.
How? A citizen's own government might conceivably know who you work with professionally via the tax agency, but a foreign government doesn't (not without specifically requesting such data on a case-by-case basis). For most people who use Facebook, their list of contacts will provide any big data analysing actor with a very nice outline of their life and interests, especially if you are the type of state actor that can coerce Facebook into cooperating.
Even if your own profile is clean and seemingly meaningless, mom will have you tagged as her son/daughter, and who you communicate with and when will quickly filter out the uninteresting friends.