Now, the spread of the Internet is changing the world dramatically. One of the examples is that using websites and SNS for advertising and communicating on politics. Not only political parties but also every individuals can show their opinions easily on the Internet. I think this is very important for the progress of the world peace. The internet is also useful for the handicapped people. They can do everything at home even if they have disabilities on their bodies. Studying, shopping, communicating with friends, and so on. For these reasons, I agree with the opinion that Internet had a positive influence on our society. soa natural?

Some corrections:

Now, the spread of the internet is changing the world dramatically. One example is the use of websites and SNS for both advertising and political commentary. Indeed, not only political parties but individuals can voice their opinions easily on the internet. I think this is very important for the progress of world peace. The internet is also useful for handicapped people. They can do everything—studying, shopping, communicating with friends, and so on— at home, even if they have physical disabilities. For these reasons, I agree with the opinion that the internet has had a positive influence on our society.

Just a side note, but in the west, we don't use the term 'SNS' to refer to social networks. We usually call it 'social media'. Depending on context, it also might be more natural to start off with 'Today,' instead of 'Now,'.

Keep up the good work!