What does Twitpic do on your Twitter account?

[one of twenty]

I'm thinking about using Twitpic.
When I tried to log on using my Twitter account this is what it says:

This application will be able to:
Read Tweets from your timeline.
See who you follow, and follow new people.
Update your profile.
Post Tweets for you.

What exactly does this mean? What are some updates it will do to my profile? What does it mean it will post tweets for me?
I'm new to this. Any help is much appreciated.

[Amanda Marie]

Twitpic is actually totally safe. That's why Twitpic and Yfrog is the most popular picture sharing sites for Twitter.
When it asks you to authorize an app (For Twitpic, or like Share on Youtube) You are giving it permission to let it make a tweet for you basiccly

The updates it will do to your profile is Twitpic Tweeting out (Or posting) the tweet you just set up on Twitpic for you.
So if there's ever a share on Twitter, or a twitter add on/ app, It will always ask you to proceed. For it to see you timeline etc is like how RSS feeds work.
Hoped that helped