Regarding Google and LinkedIn, I keep complaining to them about a stupid feature of Gmail. If I get an invitation from someone, Gmail puts "accept" as a button in the subject of the email - so if you aren't careful you can accept while you are scrolling through the subject lines. That is just the worst feature to put in their subject line.
Actually, it looks like they fixed this problem. I just checked all the messages with the LinkedIn label and I don't see it popping that "hotspot" anymore. The only thing that pops up in the subject line is now "Unsubscribe", so that is really good.
I don't think so. At least not from the inbox, where it happens. I'm not in the message - I'm just dragging on the subject lines to scroll, and these "hotspots" light up on the right portion of the subject.