Viberly.com is claiming to give away free monthly subs to theses services simply for displaying one of their advertising partners stickers on your laptop, FOREVER. I haven't tried it yet, so YMMV, so there's that. Converse and DropBox are a couple of the advertisers.
Posting from the SD app on my phone and did a search and nothing came up, so I'm posting. Also, no real link for the same reason, but the website is simply: