Trust is built over time, but it's wise never to give out any personal information.

for my own opinion "trust the man" "do not trust the devil inside him"

I had inclination to trust people... well learned better... I'm pretty good at sensing people intentions but my naive trust kinda made me to ignore those danger signals. I say what I think about things... but that I really doesn't have that much to do with trusting people... It's more like part of my nature and the same way of testing people. I say what I think and if people get insulted about my opinions easily... they weren't my type in the first place and getting to know them would just be waste of time for the both. No idea why many people spread their phone numbers around in the internet... and give them to total strangers... I think I have got almost 50 phone numbers sent me here in italki... and most of people have sent them without even sending me single message before that... I just delete those messages and block the person if they message me again... lol I have never met interesting and intelligent person who would give me phone number just like that. I have tried to have chat with those phone number farmers and they're always boring as hell and reply to almost everything just with "ok"... So ignoring them isn't big loss. >_> From my perspective it's kinda funny person who has sent me short message which contain just "hi" "how are you?" "my yahoo" "my phone number" expects me to be interested to make long distance call? lol it's kinda hilarious... From the senders perspective it's damn retarded... they're like asking to get stalkers and phone harassment after them... Plus me calling to them would give my number to them... I have given my phone number to few persons I have met in internet and before that I had know them all for at least 1.5 years and chatted regularly with them.

actually, you can't determine whether your chatmate can be trusted or not in one sitting. it takes time to built trust towards someone. at the first time you make chat with someone, try to figure out what their goal is. you can actually tell apart what their up to considering their questions or way of chatting with you... take extra care! :)

as far as i am concerned,if you want to make friends with him or her,just open your heart and be honest,tell him or her your true feeling about the topic you are discussing,of course,as for some of your private information.it is your call whether to tell him or her.figure the situation for yourself,if your friends are honest with you,will you hide something from him or her?and will it be difficult for you to trust each other?