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Meetup.com makes it a pain to unsubscribe from groups. You have to click on each group, wait for the page to load, then click on the unsubscribe link, wait for the page to load, then click the unsubscribe link. Doesn't sound too horrible but when you have a bunch of groups it's pretty tedious. I can only assume that Meetup doesn't provide the functionality to do this because you being a member of a lot of groups is good for their metrics.

So to get around this, I created a grease monkey script that will
quickly remove you from all the groups you select:

Just load this script into greasemonkey, and go to https://www.meetup.com/groups/.
Give the page 2 seconds to load, and then scroll ALL the way to the bottom
of the page and you should see a list of goups you can unsubscribe from.

// ==UserScript==
// @name     Meetup Unsubscriber
// @version  1
// @grant    none
// @namespace https://www.meetup.com
// @include https://www.meetup.com/*
// @run-at document-idle
// @require  http://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js
// ==/UserScript==


/*
1) go to https://www.meetup.com/groups/
2) wait 2 seconds
3) there will be a list at the very bottom of the page of all the groups on the page, click on the ones you want to leave.
*/

/*
Get an inital list of links, we'll use this later to filter out which links 
are groups
*/
var init_links=[];
var links = document.getElementsByTagName("a");
for(var i=0; i<links.length; i++) {
  init_links.push(  links[i].href );
}


function page_load() {
var links = document.querySelectorAll("a");
  console.log("checking");
    for(var i=0; i<links.length; i++) {
    // find all the links that aren't in the inital list at the top, and end in a /
    if (! init_links.includes( links[i].href)) {
        if (links[i].href.slice(-1) == "/") {

        var group_name = links[i].href.split("/").slice(-2)[0];

        // Add a button you can click at the bottom of the page to leave the group
        $("#main_footer").append ('<a id=' + group_name + '>Leave group ' + group_name + '</a><br>');

        $("#" + group_name).click ( function () {
          console.log("remove", this.id);

            var self = this;

            // to unsubscribe it requires an ID, so grab the ID off that page and then unsubscribe from the page.
            $.get("https://www.meetup.com/" + self.id + "/unsubscribe/", function( data ) {

                              var token = data.match('name="token" value="(.*)"')[1];
                //console.log("token:", token);
                //console.log(self.id);
                $("#" + self.id).remove();
                $.post( "/" + self.id + "/unsubscribe/", {"exit_comment": "", "op":"submit", "token": token} );


                        });
        });

        }
    }   
    }

}

// give the page time to populate all the data on the page.

setTimeout(page_load, 2000);

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