Compared with non-internet users, today's online social networkers are likely to experience relationships with their existing friends and are likely to know their real-world neighbors.

Strengthened, less

Explanation:

With people spending more time on internet their relationships with existing friends have decreased due to lot of contents available on the internet. They might be friends with people miles away but they might not know their next door neighbor. As the content over the internet increases day by the day this trend shall keep on rising.