In my view its an entirely reasonable thing: you encounter a person who can articulate a coherent ideology, method, system (etc.) which is entirely new to you. You use that person as a means of learning this system; and when you've learnt it all, you move on.
The key thing is you arrive at a critical point where you have seen their pov and can criticise it; and that you dont end up in a cult-like following of their ideas.
This cultishness is everywhere in academia, see, eg., all the departments that are "Kantian" or "Wittigensteinian" --- people forever trapped in the work of one author. I am very suspicious of "History of"-type disciplines for this reason.
I dont see this as having to do with social media, but if at all, maybe it accelerates it. I certainly think you need much more than 6mo with any substantive person.