Should emoji/emoticon replace a punctuation mark in the end of the sentence?

If the sentence is finishing with emoji/emoticon in the website content or in a personal message, should it be followed by a punctuation mark?

Example #1

I’m glad you could make it ? We had a great time.    – This one looks fine and clean
I’m glad you could make it ?. We had a great time.   – However this one looks weird to me
I’m glad you could make it. ? We had a great time.   – Emoji belongs to the next sentence
I’m glad you could make it :). We had a great time.      – This one is super-weird

Example #2

Is that really so ?? I doubt it.   – This is OK, as the question mark means that it is a question
Is that really so ? I doubt it.     – This doesn't look like a question anymore
Is that really so? ? I doubt it.   – Again, emoji belongs to the next sentence
Is that really so =/? I doubt it.     – And this emoticon is something else

So emoji/emoticon understanding varies depending on it's position. Is there a common way of using them or are there the best practices?