Read a story lately and liked it, but didn't have time or couldn't think of anything to say as feedback? Now's your chance. Had a story on your reading list for awhile with no time to read it? Now's the time to jump in, and make sure to review when you're done. Don't have anything more to say than, "Hey, I liked this"? No problem. If you have the time or inclination to say more, go for it, but don't feel like you have to leave detailed feedback in order to participate. Part of the point of this exercise is to get used to the idea of leaving comments of any length.
The other point? Developing the recommendation habit. Once you've read and reviewed, if you want to share your find, come back and comment to this post with a link. No need to go into great detail here, either, although it would be helpful to give a title and say which fandom and whether it's worksafe. And then we'll have a rec list for everyone to check out.
Also, heyheyrenay and I were discussing this post (found via metafandom) and it brought up some issues about leaving feedback that inspired the following poll:
Do you like getting feedback on fic?
What kind of feedback do you like?
When you receive feedback, do you respond to it?
Do you leave feedback on the stories you read?
Are you more likely to leave feedback for an author that you know is likely to respond to it?