These are the only three things that I have noticed, but to honestly answer your question - I really don't know, I am just one other person who has noticed this.
Maybe there has been more than three occasions and I haven't noticed... Who knows?
But like I've said, it wasn't my PC the last time and as far as I'm aware, my girlfriend hasn't considered hiking, and she doesn't go fishing. But this wouldn't be the first time this has happened - I remember the hoo-ha over the theory that Google was targeting ads based on your e-mails when Google Mail first opened its doors. I really didn't believe that at first, but as I've said, I wouldn't have thought Facebook would be used in the way that it now is to target ads for you.
It could be a coincidence as much as it could not - the vast majority of evidence is hearsay - when it first happened I thought it was just my imagination, but the following couple of times made me question it further. I do think however that this kind of marketing would be a logical next step - the act of going on the internet and searching for equipment based on an activity is an
active process - back in the mid 90s the thought of search engines using this information to target you with advertising would have been
fairly unbelivable to the common user.
Fast forward a few years and the idea of targeted ads based on your personal details (ala Facebook) would also have probably been unbelievable. But having a passive feature to target you, about what you 'plan on doing' must be the holy grail of marketing.
With the advent of vocal commands (such as 'Google Now') and the Facebook chat concerns in 2014 - it really isn't a stretch of the imagination to see how this could be a very useful tool for analytics and consumer insight.
Whilst this article (
http://www.forbes.com/sites/kashmirhill/2014/05/22/facebook-wants-to-listen-in-on-what-youre-doing/#518ca956336b) goes aside of the topic as it stands, it does offer an insight into how it
could be used for nefarious purposes.
This article (whilst providing no physical evidence) is also food for thought -
http://www.iflscience.com/technology/it-s-not-just-your-tv-listening-your-conversationAgain, this article begs similar questions -
http://www.theatlantic.com/technology/archive/2015/11/your-phone-is-literally-listening-to-your-tv/416712/One of the more interesting paragraphs in the above article is how the Facebook feature in fact converts to data, as oppose to storing conversations. Additionally however, the article does point out that users have to 'opt-in' to the Facebook 'feature'.