Sharethis.com.
You can modify the looks a bit, choose which social share buttons to include, as well as the position (floating side), only desktop or mobile (or both), include it inside your content (wherever you copy and paste the code).
Bare in mind that these kind of javascript includes will slow down your website. So, if you don't expect to get that many social shares, you should consider not adding them at all.
Edit: Nevermind, I see you're looking for a share link only... by the way, doesn't FB and such pull the title automatically? For images you'll need to add some more to your header:
https://css-tricks.com/essential-met...-social-media/