Thats what i meant, strava can set an automatic zone based on your postcode, if the start or end of your ride are in this area they will not show to any other users (even friends). NOTE; middle sections of rides will not be removed so if you nip back to your house mid ride we will know where you live exactly ;0)
You can supplement this manually by turning your GPS on/off at other locations. Depends where you live but 100yds would be useless to hide the fact i lived on the street i do, would just take someone to sit on the street in morning/after work to see me arrive home on the bike.
Again, depends how paranoid you are about thieves, the above is a bit extreme but some folks do worry.
[edit] you can also doctor your rides in strava, cutting bits off the start/end, another option for the paranoid ;0) [/edit]