"Used to like Instagram..."
...for the first 5 minutes before you had to trawl through thousands of 'selfies' and advertising pics to see any genuinely creative or thought-provoking pics. The last straw was when i recently posted a pic and instantly got 6 likes, all from 'users' with stuff to sell or promote.
That happened to me when I first set up my Twitter account. Spent five or ten minutes poking around on my feed, getting the hang of the interface and such, and in that short time I'd racked up about ten "followers", all of whom were "hotties in my area" or 'bot profiles with fake "selfies" ripped off from some other site all claiming to just adore the tweets I was posting and supposedly dying to meet me. I blocked and reported them for spamming, of course, and learned how to spot 'bot and spam followers real goddamn' fast. Happily, that bullshit subsided fairly quickly.
I was actually pretty surprised that didn't happen when I set up my Facebook account. Granted, I hardly ever log on there, I gave FB totally fake gender/residence/birthday info, and left all those personal interest, profession and education fields blank, but, still, I was genuinely surprised at not being deluged with fake friend requests from Hot Guys In Tripoli Who Were Wanting To Meet Me Now.