I used to click "Like" on various things in Facebook, but after starting to see them in my feed I immediately un-Liked them. I'm willing to tell my friends I like Logitech keyboards, but I'm not willing to see whatever posts the Logitech PR decides to write. If I'm interested to learn about what new keyboards/mice there are in the market, I'll find it myself, thanks.
Clicking "Like" used to be a fun, whimsical thing. Now it's been turned into a marketing vehicle (I don't fault FB for doing that), so now it's more like a "Spam me please" button. It feels like more of a business exchange rather than an expression of my preferences.