introvert persons {4}

I think it would be more natural to say 'introverts' or 'introverted people'

accsess {3}

access

background

backgrounds

business interest in short time {2},

I know what you mean here, but it would be better to say something like: 'When you need to send a business letter in a short space of time...'

I was a little skeptical towards it at first, but now I'm aware of the positive effect it has proved to have on my life.

Well-constructed phrase or sentence

The internet, one of the latest discoveries of the 20th century, has become part of everyone's vocabulary nowadays. Whether we like it or not, it is turning more and more into a social phenomenon, especially among teenagers.{1}

Nice introduction!

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