can I make friends here?or do anyone have group here? So that we can discuss and chat and enhence our knowledge.

you should follow someone and then he should follow back you. then you can chat to each other

Yeah .We can make friends here . We can't make group . You can chat here ,if someone follow you and if you follow back him ,in this case chatting is available otherwise you can't .

one guy started following me. I followed him back. but I dont think he is present or available here.cuz his last post was posted in july. m wondering now how he started following me...!