AddThis provide nice, responsive social marketing buttons, which it claims leads to an average 20% increase in social shares across sites that use its widgets. Clear, bold design is a great start as far as encouraging your traffic to share your content is concerned, but where AddThis really comes into its own is with the following, marketing and intelligent ‘recommended content’ functions it can offer. The suite of tools is available free of charge, with pro packages kicking in from just $10 a month – a bargain, if you’re able to use these tools to their potential in lifting social engagement rates, email sign-ups, clicks and leads.