Pinterest follow button plugin give an ability to maximize your followers of Pinterest account.

Easily and safely add a smart bar with social media follow buttons (not share, only links to your social media profiles) to any place (post content, page content, widget, sidebar, header, footer) of your WordPress website.

Your Favorite Social Media Share and Like Buttons Plugin / Widget for WP. Twitter, Facebook Like Button, Google+, Pinterest, Tumblr, LinkedIn, Xing

Single Tweets Widget is wordpress widget though which you will able to show your twitter post on anywhere of your wordpress website.

Enable your readers to subscribe to custom email alerts for all the topics, authors and categories of your website.

This plugin provides a widget to show a youtube subscribe button. Also number of youtube subscribers can be displayed.

Official Twitter and Periscope plugin for WordPress. Embed content and grow your audience. Requires PHP 5.4 or greater.

Allow your visitors to add their twitter.

Create Twitter follow buttons either by using shortcode or use WordPress widgets to place follow button on your blog sidebars.

TT Like & Follow for WP-Multisite gives you the chance to add basic Social Network features to your installation.

A widget that displays your latest tweets from your twitter account. This plugin is compatible with the new Twitter API 1.1

Embed Twitter Timeline/Feed, Post, Video, Hashtag, Follow Button, Tweet Button easily. This plugin is lightweight but super powerful.