My first thought was why would someone halt their socials? Too much holiday time? Then I realized this was social media :-P. Socials to me are precisely NOT social media. Is this a common language usage now?
this might be a generational thing or a geographic thing, my nieces and nephews use the word "socials" while I always use "social media".
Not where I live if you're older than middle school age
Yes
Yes. “Socials” has been functionally interchangeable, especially in written form, for probably 2+ years now, in my experience.