What exactly kind of graph is this? I see three plots: a blue line, a thick purple segment and black speckles. None of them are labelled. Is one of them a me

What exactly kind of graph is this? I see three plots: a blue line, a thick purple segment and black speckles. None of them are labelled. Is one of them a mean, for example? What is the variance in these data? My gf and I only post on each other's pages once per month, max, for example, yet we ust be part of this "study." The variance is especially important because the six-month span from top to bottom (1.66 - 1.54 = 0.12) is large compared to mean of the whole graph (~1.60). What kind of selection criteria were used to create this graph? How many couples? What ages? What countries? (I don't accept "worldwide" b/c I don't accept that people of all countries post at the same rate). This "information" has all the marks of Facebook trumpeting their macho data muscles to impress advertisers and the Atlantic flexing their paranoia muscle to stoke reader's outrage. I suspect those black dots are simply graphical saccharine to give the aesthetic appearance of "data."