Initiative counts as an ability check, does that mean you can get (dis)advantage on it?

@PhilippMordashe @JeremyECrawfordInitiative counts as an ability check – does that mean you can get (dis)advantage on it? What are the examples? you can – I believe it must specify it applies to initiative or dex checks #wotcstaff

— (((Mike Mearls))) (@mikemearls) August 11, 2016