These crawls are part of an effort to archive pages as they are created and archive the pages that they refer to. That way, as the pages that are referenced are changed or taken from the web, a link to the version that was live when the page was written will be preserved.
Then the Internet Archive hopes that references to these archived pages will be put in place of a link that would be otherwise be broken, or a companion link to allow people to see what was originally intended by a page's authors.
This is a collection of web page captures from links added to, or changed on, Wikipedia pages. The idea is to bring a reliability to Wikipedia outlinks so that if the pages referenced by Wikipedia articles are changed, or go away, a reader can permanently find what was originally referred to.
Definition: The Tweet button allows you to quickly share the webpage you’re viewing with all of your followers. Clicking the Tweet button provides you with a pre-populated Tweet containing a link to that webpage, which you can customize before sending.
How to use the Tweet button:
When you see the Tweet button on a webpage that you feel like sharing, click it.
If you're not already logged in to Twitter, you will be prompted by a pop-up box to log in.
A Tweet box will appear for you to post a Tweet linking to the webpage you visited. Your remaining characters are counted in the bottom right. Edit the Tweet if you would like to.
When your Tweet is ready, click “Tweet.”
The box will then show you information about related Twitter accounts – you may follow these users, or simply close the box.
Continue browsing the web. If you’d like to confirm that your Tweet posted correctly, visit your twitter.com profile.
Customize the Tweet button – choose pre-populated text for the message, and confirm which Twitter accounts you'd like to suggest to users. The main account you specify will become an @mention in the Tweet. (By default, we'll use the username of whichever account you're currently logged into in the button.)
Copy and paste the code into the HTML of your website wherever you would like the button to appear.
You're done!
Note: The optional Tweet counter for your button captures a sum of all Tweets and retweets of your content, so you can watch the message spread as people share it.