Comment: Someone not as paranoid as I am care to clarify/help?

Before they accept my vote, I get the following:

You're about to authorize your first app! Sweet!
Authorize Shorty Awards to use your account?

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.

The bottom 2 that are in bold are the ones that concern me the most. They can mean TWO VERY DIFFERENT things - depending on how you read them. While I DO realize how WE"RE SUPPOSED to read and understand them, I have a feeling that this can be flipped around to the other meaning in the future - regardless of HOW or WHAT I thought they meant.

Call me paranoid, but I've had my fair share of Sneakware downloaded enough times, and blatantly lied to before installing a program where said program proceeds to add & install "searches" & "toolbars"(& who knows what else) AFTER specifically clicking on the box that I DO NOT consent.

I read through all the comments & didn't read one concern or mention about this, so if anyone can maybe shed some light?