is this sentence grammatically and punctually correct?

May, that's a phrase (someone surely will tell you what kind), not a sentence. Otherwise grammar seems okay although...

It's because I want to find some friends from around the world and become familiar with their cultures

Yeah, like Dale said, it's not a sentence; it's a clause. It would be a sentence if you just left out the first word ("because"). But the word "because" suggests that a stated "reason" or a "consequence" will follow to complete the sentence. For example:

Because I want to find some friends from around the world and be familiar with their culture, I am going to join an internet chat group with members from all over the world.

In a particular context, it could be a sentence where the remainder the sentence would be implied. For example:

Question: Why did you join an internet chat group with members from all over the world?

Answer: Because I want to find some friends from around the world and be familiar with their culture.

thank you so much for your valuable ınformatıon

No problem, friend.

May when I attempted the following posting,



...I was rejected on the basis that I had already posted it, which I hadn't. Sometimes a2k software....

....tho oft not. It's okay a2k fellas, just sorta kidding

thanks to all