I've heard that it is because of Google's update.
More concretely, after the launch of Gmail Add-ons (Oct 24, 2017), the right-hand-side of Gmail has been removed.
People widget has been very important and good feature for me until now.
I really hope Google will revive this feature. Please...
Right-click the chat button (in this case, the balloon thingy) and select the option "Inspect Element" (or similar). It is available in most desktop browsers (I tried Chrome, Firefox, Edge, they all had it), and should be available in mobile browsers, as well.
You should see something like <div class="intercom-launcher-close-icon">. Searching for "...
You don't do this using the "Intall Widget" feature - that's about adding the widget to the Blogger library, not to your blog.
Instead, go to the Blogger dashboard, choose Layout for your blog, and then Add a Gadget.
Automatically? Apparently not any more.
However, you can achieve what you want on a per-post basis by using the magic of shortcodes. Specifically, the display posts shortcode.
Add the shortcode [display-posts] in a post or page, and use the arguments to query based on tag, category, post type, and many other possibilities.
Depending on what you want to ...