Sanhedrin 74a states that if the non-Jews are accustomed to have red shoe laces we should not have red shoe laces.
What is the extent to this rule of not copying the gentiles?
I have a few questions on this
What is the extent to this? For example if the gentiles make Facebook can I go on it
What about something that is not made for both Jews and gentiles? For example a famous habit they have done?
What about something that falls in category 2 (or 3) (does it matter?) but it was also done by Jews? For example Facebook?
So like I said above my question is
What is the extent do we follow the rule of not copying the gentiles?
See Kitzur Shulchan Aruch Siman 3 Se'if 2