One of my favorite features of Instapaper is the ability to tweet an article with a "Tweet Shot", which basically allows you to highlight a portion of the article and then Instapaper will take the text and create a nice image for you to attach to a tweet.
While this is a great feature I don't always want to have to save an article to Instapaper just to create a tweet shot. This is where Linky comes in. Linky is an app that primarily works within your share sheet. It allows you to share from Safari (or Chrome if that's your thing) to Facebook or Twitter. You can set it to automatically include the title of the webpage and/or a link as well. But it also allows you to create an image similar to Instapaper's tweet shot.
In order to do this you just highlight the text on the page, invoke the share sheet, and then add an image through Linky and it automatically creates an image of the text for you (see above). The app is $3.99 in the App Store (Purchase). I've created a short video below showing the features of Linky in action.
You can read Macstories full review here.