It means Support for Support. Its usually used by layout sites to help get more users to use their layout code on social networking sites. Lately it has evolved for use by social networkers as a way to add more friends to their friends list. For example, on MySpace someone may post a bulletin promoting another persons page with reasons to add and not add them. In turn the person will return the favor resulting in both acquiring much more new friends or "Add Requests". This process is known as Support for Support (s4s) or W4W.
S4S means surfaced on all 4 sides.
One common meaning for it is "shoutout for shoutout".
Square all 4 sides.
It means Share for Share - you share their pictures, they will share yours.
Eased 4 Edges S4S = Surfaced 4 Sides
If its on facebook pages, it means Share4Share
It means support for support.
Smooth 4 sides. All four sides have been planed.
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Open Safari. Go To The Page On Facebook. And Copy The Web Address & Then Go To Post It. (It Doesn't Give The Blue Link Though) If You Wanna See The S4S's On Your Page, Click All ; Instead Of -Your Page Name Here- (It's Under The Thing That Says 'Share Post')
Board feet is the unit measure of rough lumber. Linear feet is the unit measure of S4S lumber. (smooth 4 sides)