Exposure to things you would not look for by yourself to find interesting reads.
Browser extension that analyzes (subject, intellectual level, etc.) websites you visit and suggests new ones that you would never think of by yourself.
Many times you read an article or a blog post that states as a fact something you know to be wrong.
A browser extension and a server side service that enables you to leave a comment on any site. This comment should be reasoned and if possible backed up by reliable data with link and attribution. These corrections will be approved by editors before they are visible. The approved comments will be visible to others using the same browser extension, or to all if the website itself chooses to incorporate the system (1 line of code in their HTML source.)
You visit a content page you invested time and money in creating, and would like to know how is it doing.
A browser extension that connects to your Google Analytics account and gives you indications as to how Google might see this page’s SEO performance. Bounce rate, scroll rate, returning visitors (to the site), click through rate, etc.
It would be very useful to immediately be able to highlight something you read, and have it in an online library with a link to the original document.
Have an iPhone extension (and comparable solution on Android phones) you can use when you read something and would like you can invoke when you selected a text in a document that has a URL. When invoked the extension should save the selected text with a link to the original document URL in your own online repository that you can access anytime on the web or with the app of the extension.