Here’s an interesting little thing.
This button (fig. 1b) will move the result to the top of the page and add this orange marker (fig. 1a) next to it so you can easily recognize it. The result(s) you promote will appear at the top whenever you search for the same keyword(s) in the future.
Maybe it’s old, I haven’t seen it previously. Looks like one of those personalization of SERP features that allows you to manipulate your own returned search results.
At the moment it seems like you need a Google account to use the thing, which may be a sign that they’d like to use such signals to affect SERP outcome. Not to mention user demographics, behaviours and all that other track your movement stuff.
What I’d like to know is whether or not they will be taking such factors into account long term. If a lot of people continually push a result to the top, does this mean that it’s a great result, or does it just mean that some group of SEO’s have found a way to cut in and mimic a few natural behaviours? How many Google accounts do you have?