Simple Solution: Keep a Ziploc bag in every sock drawer and place the lonely little sock in there until its mate is found! Matching them up will be a cinch later.
Or, keep a separate container in the laundry room for the stragglers. This is always a good stand-by, but you end up having to dig through everyone’s socks rather than just that person’s.
The great thing about keeping them in the bags is, you’ll also have a better idea of how long it’s been in there and when it’s time to give up hope and pitch it. (or use it for cleaning!)