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Works perfectly with WordPress Multisite 3.3.1 BuddyPress 1.5.2
Plugin Installation and Use Instructions
To install:
- Install the Post Indexer
- Download the plugin file.
- Unzip the file into a folder on your hard drive.
- Upload the /global-site-tags/ folder to /wp-content/plugins/ folder on your site.
- Visit Network Admin -> Plugins and Network Activate it there.
Note: If you have an older version of the plugin installed in /mu-plugins/ please delete it to avoid errors.
To use:
It should auto create a page called "tags" on your main blog where anyone can search through all your blogs.

On the off chance the page isn't auto created all you need to do is create a page with the slug "tags" without the quotes if the plugin fails to auto-create the page.

Changing how tags are displayed on your Tags page is as simple as:
1. Go to Site Admin > Options

2. Scroll down the page to the Site Tags Section
3. Select the number of listings you want to display per page - this is the number of posts displayed on a page when you click on a tag on the Tags Page

4. Adjust the color scheme, if you want
5. Add tags you don't want included on your Tags page and select your preferred Tag Cloud Order

6. Click Update Options

Adding a Global Tags widget to your homepage
1. To add the widget to your homepage just go Appearance > Widgets

2. And add the Global Site Tags widget to your sidebar

Using your tags as a user is as simple as:
1. Go to the Tag page or Tag Cloud on your homepage
2. Click on the tag they want to check out

3. This opens up a chronological, paginated list - with avatars of all the posts for that particular tag:

Please note:
- Tags on private posts display on the Global Site tags page but if you click on the link and no posts are listed this means they are all posts on private blogs (only visible to logged in users).
- To display avatars your users will need to upload their avatar via Users > Your Avatar.