Looking for similar plugins…

Hi there.
I’m looking for a couple of plugins and have been googling and coming up short.
It would be great if someone knew of something similar to the following:

“Discussed in this post”
A plugin that shows one or two subjects,tags or twitter hashtags and explains them in a small box beneath the post.
For example: Write article about Google+. A small info box about google appears with link to more info at end of post.
Write article about rap music and mention Jay-Z,a small info box about Roc-A-Fella Records and Jay-Z appears with link to more info at end of post.

“Trending Tags”
A box in the footer or at end of post that shows current trending tags on twitter and a link to twitter or shows links to articles containing those tags or hashtags.

“On Twitter”
A box at end of post where you can see what people are discussing about a tag or hashtag featured in post.

“Related Posts on Other Sites”
I already have a related posts plugin that finds posts on my site similar to the one being read, but I would also like a second one that shows related posts on other site.

example:
Post about dinosaurs.
Content.
Related posts on my site:
“post one”
“post two”
Related posts on other sites:
BBC: Post on dinos
HuffPost: post on Dinos
The Times: post on Dinos
Comments.

Thanks in advance