Yahoo! Groups

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Yahoo! Groups
Yahoo! Groups logo
Groups-yahoo-com.png
URL http://groups.yahoo.com/
Project status Online!
Archiving status In progress...
Project source Unknown
Project tracker Unknown
IRC channel #archiveteam

Yahoo! Groups is Yahoo's email service; it's the result of the acquisition of eGroups and some other Yahoo! stuff.

It's been stable for a long time (since the late 90s), long enough for some specialised software to be developed to do backups of it. (Not many other websites can say that.)

Python Yahoo! Group Archiver

The yahoo-groups-backup is a Python script which allows a scraping of the group. So far only messages are scraped. It puts all the info and metadata (both rendered message body and raw email) into a Mongo database, and provides a script to dump a static version of the site that can be read off of the filesystem. It works with Neo and with private groups by clunkily using Selenium to do the scraping.

Yahoo Group Archiver

The Yahoo Group Archiver is a Perl script which allows an export of "the messages (without the attachments), everything from the files section and all the images from the photo section along with their hierarchy on Yahoo".

It appears that, if you get the "Couldn't get message count" error when trying to use it, the solution is to edit the yahoo2maildir.pl file and replace the bottom line my $url = $HTTP::URI_CLASS->new($redirect, $base)->abs($base); (under the heading sub GetJSRedirect) with my $url = "http://groups.yahoo.com/group/$group/messages/$begin_msgid";

More frustratingly, it appears that Yahoo blocks your IP temporarily after hitting some invisible limit of data downloaded (the Archiver will continue to "download" messages for a bit, ending up with a bunch of 0-byte files, then stop completely). It's unknown if there is a solution.

Also: sometimes, some of the downloaded messages, in the middle of an otherwise normal batch, are 0 in size - almost as if Yahoo blocked your IP for a few seconds, then stopped. Watch out for these so that you can re-download them later.

Site structure

There’s a convenient JSON API:

Note that all paginated responses are limited to the first 500 results and do not return anything new beyond that.

Statistics

As of 2015-10-23 the directory lists 5458443 groups. 2752112 of them have been discovered. 1483853 (54%) have public message archives with an estimated number of 8.4 billion messages (~5600 messages per group on average so far). On 2016-07-10 380 million messages (5%) had been archived.

Yahoo groups date created.png Yahoo groups messages per group.png Yahoo groups post date.png

Software for backups

External Links

References



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