Response to Blog-Knowing

I am responding to Beky's blog in which she asks, How do you truly know someone? and Is this a radical constructivist view on people?

I too have heard people talk about someone I don't know (usually in a negative light) but I usually dismiss it. Though it sounds cliche, you can't really listen to people when they talk about someone else and until you have experienced them for yourself. There are usually two sides to the story and maybe the person who is talking malicious things about a person one doesn't know is fuel to the fire. I have heard so many things about people I don't even know and have believed some things and dismissed other things. I know it is wrong to believe anything you hear but, I'm human. It isn't until my interaction with them that I am able to confirm, or dismiss the things I heard, (usually for me it is the latter).  Though what I just said should be taken into consideration, you must also know that you can NEVER truly know someone. This is because people are always changing. Values, morals and beliefs aren't set in stone and therefore the way a person acts or the way you get along with a person is never set in stone. People change everyday for the better or for the worse. A person changing always happens because life changes people, experiences and circumstances changes people and therefore by the time you think you know someone 100% you are back to 0%.
I am not sure if we can call this a radical constructivist view on people. It is hard for me to really answer the second question because I feel I have to contemplate on it more. One thing I do know for sure is, as stated before, don't believe everything you hear about someone before you yourself experience them as a person. When you finally get to know the person, take them in as the days on. With that said, what is trust to you and if you can't 100% know someone how can you have it?