What features of Stack Exchange sites do you consider "hidden"?
Attached Firefox/Internet Explorer search plugin. In Firefox, when you are on Stack Overflow, just click on the search dropdown (to the left of the search text field) and hit Add "Stack Overflow".
EDIT: SO-family sites now also support OpenSearch, as described in this question.
You can see the history of what happened to a post (question and answer) by going to:
In the details that are shown, a lot can be clicked to expand.
This also works on Area 51.
2020-01-16 update: This has been implemented as a site-wide feature.
While in the /about page aka guided tour of any site (e.g. Stack Overflow about page) in the network, press the following keys in the following order:
This is known as Konami code, and will cause the site icon on top of the page to become the Stack Exchange Venn Euler diagram.
If on mobile device, the following should work: tap-drag up, tap-drag up (,down,down,left,right,left,right), and then tap thrice.
Kudos to Geoff for revealing the existence of that easter egg. :)
If you have 1000+ reputation, you can click the score of a question/answer and expand the net value to see the total of upvotes vs total of downvotes
The nofollow attribute on your profile website link is removed at a rep of 2000.
You can search for multiple tags by typing them in the URL separated by
%20. This does an AND search, i.e. only questions with all the tags you specified will be shown.
searches for both the 'windows' and the 'com' tags
Alternatively you can type the following in the search box in the top right for the same results:
*C#* to your ignored tags will ignore any tag that contains the letters C#, including
visual-C#-express-2010. Likewise for favorite tags.
This is useful because there are often questions tagged
C#-3.0 but not
C#, so just ignoring C# wouldn't catch this. Its a really nice solution to ignoring all questions on a given topic.
You can even use it to ignore all questions not in your favorite tags by just ignoring
I recently learned that the Your Question/Your Answer editor has an auto-indent feature (in source code blocks): Try Shift+Enter.
#stackoverflow IRC channel on freenode, and the SObot that will post new questions in the channel as they're posted.
Comment timestamp is a permalink to that comment: (need to right click it --> copy link address)
In the above example clicking that timestamp leads here.
It's possible to view the markup used to create any question or answer. (This may be useful if you wish to combine answers or quote part of the question with formatting.)
If the question or answer has been edited so that it has an edited X timeunits ago link, you can use that to view the revision history, then use the view source link.
If it hasn't been edited then you can still view the revision history, but you'll have to manually enter the url in your browser's address bar. For questions, take the number in the middle of the page's url; for answers use the link link for the answer to get it's unique number in the anchor of the url (after the # character) and then go to:
Well, not only related to Stack Overflow but also AWESOME: ODATA for all Stack Exchange sites.
There's even some saved queries to know. For example, how much is still missing for me to get the X badge.
This is awesome!
Sending a chat message consisting solely of
this is fine now oneboxes to this comic:
If you want to test this for yourself, please use the Sandbox room to avoid bothering others.
When you search for a popular keyword the search gets auto-converted to a tag search.
You can override that by prefixing a plus sign.
Every site on Stack Exchange network has a "network login help" page, which run a few tests to check for the availability of certain necessary features in the user's browser.
To reach the page just append
/network-login-help to the URL of any site, e.g. for the main site: https://stackoverflow.com/network-login-help
To find the age of specific site, you can view the profile of the site's Community account, then the "member for" is the site age since this is the very first account ever created on each site.
For example on puzzling site: (URL template is
Easier than going to the full sites list and looking for the site you want. :)