Home internet is a luxury if you already have a data plan on your phone to accomplish the necessities - that is for access to government and corporate web sites and educational (school related) needs. Social media, in its basic forms are text and photos which also should fit in most included MVNO data plans such as this one from US Mobile which is $22.50/mo or $228/yr (19/mo)

Unlimited High-Speed Data Unlimited Talk & Text 20 GB Hotspot Data

FYI - I live in a fairly rural area and have coverage. The standard home internet plan here runs about $90/mo after all taxes and tithes are paid.