Denis Lam

WordPress generates shortlinks for your posts and pages. By default it uses the <code>?p=</code> with the post ID added to it, but if you have a rather long domain name this isn’t very useful. If you use <a href="http://bit.ly" rel="nofollow ugc">Bit.ly</a>, this plugin will help you replace the shortlink WordPress generates with a proper Bit.ly shortlink.
This plugin uses the latest Bit.ly OAuth 2 draft specification API instead of its deprecated V3 API and enables you to use generic access token to automatically enable Bit.ly shortlinks in your entire multisite network without the need for each site user to have to tinker with any settings or authentication configurations.

Bit.ly Shortlinks Multisite (Uses OAuth 2 API)

This plugin replaces the default WordPress shortlinks with Bit.ly shortlinks for your single site or multisite WordPress network.

zackproser

The Twitter Hashtag Blaster enables your readers to send your content into Twitter conversations surrounding your target hashtag.
Do you run a humor website? Set your hashtag to #lol and start enjoying increased traffic from Twitter. Is your content about #football? #programming? #fashion? #politics? You can target any hashtag you like.
Once installed and activated, go to Settings -> Twitter Hashtag Blaster.
Here you can enter your target hashtag and choose whether the button should be small or large.

Twitter Hashtag Blaster

Add Twitter hashtag buttons at the end of every post, for any hashtag you want. Sends shortlinks to your articles into Twitter!

Bit.ly Shortlinks Multisite (Uses OAuth 2 API) vs Twitter Hashtag Blaster