If they're using fake papers to work, they're paying income tax (and payroll tax is paid for them as well) but can't file for a refund or unemployment insurance payments. They pay into Social Security but won't be able to collect it (though I think anyone under 50 can probably relate to that).
When they buy things, they pay sales tax like anyone else.
They pay their landlady's property tax if renting and pay it themselves if not.
I'm not familiar with the term "neoclassical liberal", but in the US:
"Social liberal" means liberal on social issues (people should be able to do what they want, government shouldn't police morality or sex, against segregation and discrimination) but not on other issues (eg. national defense, economics, criminal law).
Whereas "progressive social Democrat" is in favor of actively correcting social ills, eg. with affirmative action hiring, better public education, comprehensive sex ed; while also holding left-wing economic positions and otherwise falling in line with the DNC.
Seven years isn't a bad halflife for a social-media platform. That's about how long thefacebook was actually usable, that's about how long I was active on reddit, that's about how long I was posting on my blog every day. That's significantly longer than I was using livejournal or iLike.
Race being a social construct does not make slurs any more permissible to use.