Have some Twitter questions..?

[D J]

I was thinking of joining Twitter, I have some friends on it but there are some things I am very confused about!

-First - what is the difference between twitpics and lockerz? Can you see who views your pictures?
If so :: (Can you only see if your followers view your pictures or can you see when people not following you view them? )

-Can you explain the symbols and the way twitter works?

-Do you also have to sign up for the pics sites to upload your pictures on twitter?

- How do you find friends on twitter?

- What is trending or the # sign mean?

- When you use the @ signs what is the difference when used before or after someones name ? How do you know who is making the statement or asking the question?


These are just a few things I am confused about..any information is greatly appreciated..I have a facebook page and used to have a myspace in the past and found them easy to use and twitter looks so much simpler but it confuses me greatly for some reason..

Thanks so much!
I have a blackberry ..can you "tweet" from that device and see others tweets?