This is probably no big surprise to anyone - but this is how I get "targeted traffic" in FB and Twitter.
Both sites in the upper right hand corner has a search box. For an example - if you had a website selling red widgets - type in "red widgets" in the search box. There will be groups that come up as results. Go into each group. Sometimes, one group may have thousands of followers. Just click on followers and start following ppl.
In return, I would say about 10% (not really sure about that figure) will follow you back. Once you get to your "magic number of followers" - that's when you can simply put quality posts up - maybe an article about red widgets. You may post another URL to a youtube video about red widgets. Make sure none of these links are affiliated w/ you. This is to show ppl that you aren't a spammer.
Every now and then - put a link back to your site like - an article on red widgets - then you may get some high CTR.
That's how I play the game. I'm averaging around 15% CTR from Twitter (to my site) everytime I make a post.