What does this button do?

What steps will reproduce the problem?
1. Some tweets -- I think the ones with URLs in them -- have this button in the 
bottom right of the screen that looks like a download button.
2. Click and hold does not produce a pop-up.
3. It marks the tweet with that icon.

What is the expected output? What do you see instead?
A descriptive toast message should pop up like most other buttons in Android. 
Also maybe a more descriptive icon.

What version of the product are you using? On what operating system?
Latest version in Google Play Market (1.1.1)

Please provide any additional information below.

Original issue reported on code.google.com by mattc...@gmail.com on 30 Oct 2013 at 7:52

Attachments:

Screenshot_2013-10-30-07-46-03.png

verayan / twimight

What does this button do? #20