Here is a handy list for all social sharing buttons:

WhatsApp Share Button:

Sharing link on WhatsApp from mobile website and from Desktop site. WhatsApp Sharing Button Generator using api.whatsapp.com official new API documentation.

WhatsApp social share URL:

1	https://api.whatsapp.com/send?text=[post-title] [post-url]

You will be redirected to page which shows you details about Post
Click on Send
You will be redirected to web version of WhatsApp Ã¢â‚¬â€œ web.whatsapp.com (if on Desktop)
Choose contacts or groups in next screen
Click Send

Facebook:

Facebook social share URL:

1	https://www.facebook.com/sharer.php?u=[post-url]

Twitter:

Twitter social share URL:

1	https://twitter.com/share?url=[post-url]&text=[post-title]&via=[via]&hashtags=[hashtags]

Google+:

Google+ social share URL:

1	https://plus.google.com/share?url=[post-url]

Pinterest:

Pinterest social share URL:

1	https://pinterest.com/pin/create/bookmarklet/?media=[post-img]&url=[post-url]&is_video=[is_video]&description=[post-title]

LinkedIn:

LinkedIn social share URL:

1	https://www.linkedin.com/shareArticle?url=[post-url]&title=[post-title]

Buffer:

Buffer social share URL:

1	https://bufferapp.com/add?text=[post-title]&url=[post-url]

Tumblr:

Tumblr social share URL:

1	https://www.tumblr.com/share/link?url=[post-url]&name=[post-title]&description=[post-desc]

Reddit:

Reddit social share URL:

1	https://reddit.com/submit?url=[post-url]&title=[post-title]

StumbleUpon:

StumbleUpon social share URL:

1	https://www.stumbleupon.com/submit?url=[post-url]&title=[post-title]

Delicious:

Delicious social share URL:

1	https://delicious.com/save?v=5&provider=[provider]&noui&jump=close&url=[post-url]&title=[post-title]

Evernote:

Evernote social share URL:

1	https://www.evernote.com/clip.action?url=[post-url]&title=[post-title]

Email:

Email social share URL:

1	$email = 'mailto:?subject=' . $[post-title] . '&body=Check out this site: '. $[post-url] .'" title="Share by Email';

WordPress:

WordPress social share URL:

1	https://wordpress.com/press-this.php?u=[post-url]&t=[post-title]&s=[post-desc]&i=[post-img]

Pocket:

Pocket social share URL:

1	https://getpocket.com/save?url=[post-url]&title=[post-title]

Here is argument details:

Argument	Details
[post-url]	The url for your blog post
[post-img]	The image/thumbnail for your blog post
[post-title]	The blog post title of the url you want to share
[post-desc]	A longer description of the blog post content you are sharing
[post-app_id]	The App ID
[via]	optional Twitter username of content author (don't include Ã¢â‚¬Å“@Ã¢â‚¬Â)
[hashtags]	optional Hashtags appended onto the tweet (comma separated. don't include Ã¢â‚¬Å“#Ã¢â‚¬Â)
[provider]	Company who is sharing the url
[is_video]	If the content is a video or not