Hello...I have registered here. -> Hello, I've just registered here.

Mmm...I'll hope to create a few contacts with interesting people. -> I hope to create a lasting relationship with a few interesting people.

It's great to talk, isn't it? -> It's great talking with people, isn't it?

Communication is important for me.  -> Communication is important to me.

I want to know English because It erases confines. -> I want to learn English because it erases the language barrier between so many people.

I kept thinking of ways to explain why I corrected your sentences the way I did but I realized that the only explanation I had was because they sounded weird. I made them all sound like something native English speakers from California would say but I guess I have to work on how to explain things! XD