The song in question is
>! Rick Astley - Never Gonna Give You Up

Because:<br><br>
not sure if you like this  
expecting to end with a kiss?  
>! Sounds like a love song, so it should "end with a kiss"

video? You saw it.  
even shared it a bit?  
>! Everyone saw it :) Many also "shared" it by trying to rickroll others.

ranting on the web somewhere  
going to give you a little scare  
>! Hides in the darkest places in teh web just waiting to attack you by an unsuspiciously looking link provided by your friend.

once it was a love song  
now? Just a click gone wrong  
>! It is a love song, but now it is used rather for rickrolling (one wrong click) than actual listening.
  
not adding this verse as a prank  
actually I did, I'll be frank.  
>! By giving a reference to this song, this can actually be seen as a(nother) prank.
  
give you a hint? I'm very picky   
I tell you it's not sung by Martin, Ricky  
>! This is a song of **Rick** Astley, not **Ricky** Martin
  
very confused about it right now?  
explanation is in here, somehow.  
>! The first letters of the sentences start with: nevergonnagIveyouup
  
young people know it.  
old ones at one point enjoyed it.   
>! Young people know it from rickrolling, older people enjoyed listening to it when the song was young.
  
unable to find something wrong   
unless you try sing along.  
please find the name of the song.
>! probably reference to some of the lyrics - as OP says - it is not a hint itself.