Post as a verb has been used since at least 1630 to mean 1 a : to publish, announce, or advertise by or as if by use of a placard b : to denounce by public notice c : to enter on a public listing
The word Internet is derived from the prefix inter- (carried on between) and network. Internet.
Both of your examples have their roots in standard English. Stop being obtuse. This is about using, for example, tissue over Kleenex or cotton swab over Q-tip.
One good suit is worth a thousand resumes.