I am always on the look out for ways to increase social media indicators on my sites. As you probably know larger numbers of +1, likes, followers, views give your site an increased trust factor.
"If so many people like this page, product, video etc... it must be good, right?"
There are hundreds and probably thousands of social media exchange sites. I stumbled on one yesterday that actually has a good amount of members and works on Fb, Twitter, Youtube, Instagram etc...
The site is like4like.org check it out.