Hi,
you can disable the plugin or set permissions.

Go to Admin panel (screenshot 1)
Now from left menu go to "Plugin Manager" and disable plugin (like Blog, see screenshot 2)

Tag manager is a core plugin. you can remove this with Theme manager, we must write a documentation. after stable version release.
Override Theme to remove in Tag Block in lists:
- Go to Admin Panel -> Theme Manager
- Click on "Social Network" under Base theme
- on left select the file Elements->blocks->tags_block.cpt
- Click on Copy button and copy it in to Blue Theme
- Go to Admin Panel -> Theme Manager
- Click on Blue Theme
- on left select the file Elements->blocks->tags_block.cpt
- Delete all content and save

If you copy the template file on Blue theme when you update Social Network these file are no overwritten.

Override Theme to remove in Tag Block in various items(video,tipics,):
You can follow same steps of previous but the block are in various files and you must delete only HTML that display the block.
Example. for topic you can delete in file Tipics->view.ctp this code:

<div class="box2">

		<h3><?php echo __('Tags')?></h3>

		<div class="box_content">

		    <?php echo $this->element( 'blocks/tags_item_block' ); ?>

		</div>

	</div>

I hope this will be useful

could you pls add this in a future release ? thank you

iam sorry did not see an edit button to change my post
i tried it as you written it and nothin happend...

i tried it as you written it and nothin happend...

Sorry can you explain me better what have you done?

Disable features is simple, above you will find my reply with screenshots