I've seen edward snowden here, he's chilling in russia now afaik.

So you like are there russian here?

And I like yeah

I've seen the guy

^^^ the second answer stating my point basically, he's put it nicely

I've already read this, haha

I mean the guy who wrote the second answer. You get it

Oh, cool

quote #1: 'When we use present perfect tense we are referring to actions which started in the past and are still happening or those actions which are finished but have an impact on the present'.
Is there any impact on the present? You just saw Edward Snowden someday.
quote #2: 'When we use simple past we refer to finished actions and those actions, results of which do not have an impact on the present.'
Seeing Edward snowden someday in the past is a finished action. No connection to now.

1. Yes, there is.
2. It's finished, true. It has the connection though.

Seriously, I don't know how to explain my train of thought better than that guy did

I saw a dog in the past; now, i've seen the dog.

quote #3: 'The difference is the time period you are talking about. The Simple Past saw is used to talk about past events while the Present Perfect have seen is used to talk about things that are true now, in the present. '
What you said IS NOT true. This is a past event. You saw him, now you don't. Don't you say you see Edward Snowden right now or 1 hour ago?))

I'm not saying I'm watching at him right now.

Aahhh, how could I explain

Past-------------(saw him!)--------(now it's the moment after I saw him, it is true that I had seen him at the moment)--------Now

Like all my life splits into two periods: before I saw him and after

This very moment changes me once and for all, and now it is true that I have seen him indeed

Before it wasn't true, now it's true