> They let your potential customers browsing your site know "hey, we're not a scammer there are real people who bought and loved our products and services, here

> They let your potential customers browsing your site know "hey, we're not a scammer there are real people who bought and loved our products and services, here's a authentic list of them." More like "We will annoy you with social network notifications, sell your data, and pollute your facebook page". EDIT: Certainly not everyone, but if you ignore the downsides you're not spending your money well. Being polite with respect to interacting with your customer is value in itself, and you cheapen your brand by including social buttons. Even the choice of button matters: including a share button treats me with more respect than like buttons AND provides a much higher quality recommendation for your brand per click, even if the clicks go down. If you're advertising on Facebook without testing which provides better numbers at the end of the quarter, you're probably not spending your money as well as you could.