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1.
s4s
used by admins on Facebook. Share for Share. you post their name on your page, they post yours. Useful and effective way of getting "likes"
"hey man, want more likes on your page?"
"sure, how?"
"s4s, bro :)"
by Love Yourself July 19, 2012
 
2.
s4s
Despite what a lot of idiots have to say about what s4s means, it normally comes into play with myspace sites (i.e. layout/contest/html sites).
Most sites have a support code, and when asked to s4s, two sites swap codes and paste into bulletins so their friends can see the code, and hopefully they get added.
It's not just for "myspace nerds" or whatever. Some sites out there have actual meaning.
"S4S?"
"Sure. Code's on the page. Supporting now."
by homoxcore August 12, 2007
 
3.
s4s
This means support for support.
Most commonly used between Myspace contest/layout.. ect sites.

You copy a sites "support code", enter it in a bulliten, and write the subject as "add this site!"

Used as a way to gain more friend requests.
Hey, I have 1,000 friends. Wanna do s4s?
by Marisahh August 07, 2007
 
4.
S4S
Stud for Stud! When a stud dates another stud!
Did you see those studs holding hands?!? Gotta love that S4S lovin'!! XD
by Princess_Veronique March 31, 2011
 
5.
s4s
Has two meanings for two different sites.

on Myspace s4s means

Support for Support

Its pretty much advertising someone else but its done through bulletins. normally people do s4s for Layout sites, Bands etc.

on YouTube s4s means
Subscribe for Subscription
You subscribe to someone because they subscribed to you.
Myspace:
Band: "hey we really need more friends can you help us get more?"
Girl: "sure but only s4s"
Band: "ok cool we posted a bulletin telling all our friends to add you, please return the favor"
-1 min. later-
Girl: "awesome I posted a bulletin to all my friends telling them to add you!"

In return both users receive a benefit.

YouTube:
Guy1: "hey everyone s4s"
Guy2: "cool, i subbed you. now subscribe back! :)"
Guy1: "thanks dude and yes i subbed back"

Both Users receive a subscription.
by gooberyo May 06, 2009
 
6.
s4s
in carpentry it means sanded 4 sides its for finish work ie; trim and furniture
1x4x8 s4s oak boards
by irish polock January 03, 2008
 
7.
s4s
Stuff for Stuff

Quick way to gain popularity and friends on myspace.

It basically means that any comments, messages or pic comments that you leave this person will be returned with the same number of comments, messages or pic comments to you.

This also applies to whoring (see w4w) and spamming, where the idea is to keep clicking "Submit Comment" repeatedly so that your comment is sent hundreds of times - this makes it look like the other person is more popular than they really are.

Kinda pathetic, isn't it.
(Usually posted in a bulletin)
s4s!! i have 7.2k friends!! s4s and your friend count will double!!!
by Paultastic April 26, 2007