W4W stands for Women for Women (women seeking women)
W4W stands for Word for Windows
W4W stands for Whore for Whore (Myspace slang for exchanging links to increase followers)
W4W stands for Witness for Wellness (University of California, Los Angeles Health Services Research Center; Los Angeles, CA)
W4W stands for Walk for Warmth (Michigan)
W4W stands for Women for Women International – Afghanistan