I remember being told that if you have a toxic type/bad boy ex-bf that if some time after you've ended it (I'm talking at least several months) that if they contact you and you don't reply, that they regard this as a "victory" - as in you are still affected by them enough to "make a stand" and not reply.
And that the behaviour that both presentionally indicates (and in fact shows you actually have) strength and have moved on is a cool and uninterested reply - because you actually really don't care and aren't scared of re-engaging because you have moved on.
With that in mind, if you are connected with someone on social media if you disconnect from them after the event, is that too much of a "I've still not moved on" statement? I mean if you've really moved on why would you care enough to disconnect from them on your network?
Assume for site related reasons, it would be fairly obvious to the person that you have disconnected from them - as in not like FB where someone with 1k friends might not notice.