The only thing others will see is an entry on your wall showing the below:
XXXXX started using myrpdata.home value tracker. · Like · · Visit myrpdata.home value tracker
If they click the 'myrpdata.home value tracker' link, they will not see yours, but their own properties (or an empty list).
I am not sure if you can still access the valuations if you remove that wall entry - haven't tried that yet.
Cheers