So I'm getting my feet wet with Instagram and posted an image this weekend with a fairly popular hashtag. It became the number one top post after a couple of hours and has stayed there for two days so far.
Instagram describes the top posts as those which are trending but other people have posted images since which have achieved more likes than mine so they should, in theory, be first.
On a second hashtag I'm not in the top posts at all but images posted before mine that achieved fewer likes are.
I'm theorising that it is not just about the number of likes but who those likes come from just as in standard SEO the link counts for more if it comes from a more respectable site.
Just guessing ... anyone know better?