For

1. A friend is someone you know a lot about in person and that also knows a lot about you and you can hardly know who someone truly is over a computer.

2. Most people's online image is a complete opposite of their real selves. So it's very difficult to tell who such person truly is.

3. Most of the people you meet online have an ulterior motive and they're always looking for what they'll gain from you while real friends add to one another.

4. For some one to be your friend, you have to know and accept their good and bad aspects. Such is not possible over the internet because everyone acts as a saint online.

5. Online friends can never be as dependable as real life friends because you can hardly see them or ask them for assistance in your times of need.

6. An online friend will hardly give you undivided time and attention because they have so many people like you that they have to attend to online.

7. Most online friendship easily fade away because of lack of common interest

8. Most online friendships are one sided because online one person makes the contact most of the time. If "A" doesn't say "hi" first, "B" will never say "hi" because "B" cares less about "A".

9. You can hardly tell what an online friend truly think of you because they will only tell you what you want to hear.

10. Online friends can't be as real with you as your real life friends. They will only tell you what you want to hear. Etc.

You can meet people with common interests online and have some good chat and time with the once in a while but you can hardly call those people your real friends because you don't actually know much about them or who they truly are.